diff --git a/core/assets/vendor/backbone/backbone-min.js b/core/assets/vendor/backbone/backbone-min.js
index f29903b..1a1f708 100644
--- a/core/assets/vendor/backbone/backbone-min.js
+++ b/core/assets/vendor/backbone/backbone-min.js
@@ -1,2 +1,2 @@
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o=function(t,e,r){i.each(e,function(e,s){if(i[s])t.prototype[s]=a(e,s,r)})};var h=e.Events={};var u=/\s+/;var l=function(t,e,r,s,n){var a=0,o;if(r&&typeof r==="object"){if(s!==void 0&&"context"in n&&n.context===void 0)n.context=s;for(o=i.keys(r);a<o.length;a++){e=t(e,o[a],r[o[a]],n)}}else if(r&&u.test(r)){for(o=r.split(u);a<o.length;a++){e=t(e,o[a],s,n)}}else{e=t(e,r,s,n)}return e};h.on=function(t,e,i){return c(this,t,e,i)};var c=function(t,e,i,r,s){t._events=l(f,t._events||{},e,i,{context:r,ctx:t,listening:s});if(s){var n=t._listeners||(t._listeners={});n[s.id]=s}return t};h.listenTo=function(t,e,r){if(!t)return this;var s=t._listenId||(t._listenId=i.uniqueId("l"));var n=this._listeningTo||(this._listeningTo={});var a=n[s];if(!a){var o=this._listenId||(this._listenId=i.uniqueId("l"));a=n[s]={obj:t,objId:s,id:o,listeningTo:n,count:0}}c(t,e,r,this,a);return this};var f=function(t,e,i,r){if(i){var s=t[e]||(t[e]=[]);var 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this.map(function(e){return e.toJSON(t)})},sync:function(){return e.sync.apply(this,arguments)},add:function(t,e){return this.set(t,i.extend({merge:false},e,x))},remove:function(t,e){e=i.extend({},e);var r=!i.isArray(t);t=r?[t]:i.clone(t);var s=this._removeModels(t,e);if(!e.silent&&s)this.trigger("update",this,e);return r?s[0]:s},set:function(t,e){e=i.defaults({},e,b);if(e.parse&&!this._isModel(t))t=this.parse(t,e);var r=!i.isArray(t);t=r?t?[t]:[]:t.slice();var s,n,a,o,h;var u=e.at;if(u!=null)u=+u;if(u<0)u+=this.length+1;var l=this.comparator&&u==null&&e.sort!==false;var c=i.isString(this.comparator)?this.comparator:null;var f=[],d=[],v={};var g=e.add,p=e.merge,m=e.remove;var _=!l&&g&&m?[]:false;var y=false;for(var x=0;x<t.length;x++){a=t[x];if(o=this.get(a)){if(m)v[o.cid]=true;if(p&&a!==o){a=this._isModel(a)?a.attributes:a;if(e.parse)a=o.parse(a,e);o.set(a,e);if(l&&!h&&o.hasChanged(c))h=true}t[x]=o}else 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r=0;r<this.models.length;r++){this._removeReference(this.models[r],e)}e.previousModels=this.models;this._reset();t=this.add(t,i.extend({silent:true},e));if(!e.silent)this.trigger("reset",this,e);return t},push:function(t,e){return this.add(t,i.extend({at:this.length},e))},pop:function(t){var e=this.at(this.length-1);return this.remove(e,t)},unshift:function(t,e){return this.add(t,i.extend({at:0},e))},shift:function(t){var e=this.at(0);return this.remove(e,t)},slice:function(){return n.apply(this.models,arguments)},get:function(t){if(t==null)return void 0;var e=this.modelId(this._isModel(t)?t.attributes:t);return this._byId[t]||this._byId[e]||this._byId[t.cid]},at:function(t){if(t<0)t+=this.length;return this.models[t]},where:function(t,e){var r=i.matches(t);return this[e?"find":"filter"](function(t){return r(t.attributes)})},findWhere:function(t){return this.where(t,true)},sort:function(t){if(!this.comparator)throw new Error("Cannot sort a set without a comparator");t||(t={});if(i.isString(this.comparator)||this.comparator.length===1){this.models=this.sortBy(this.comparator,this)}else{this.models.sort(i.bind(this.comparator,this))}if(!t.silent)this.trigger("sort",this,t);return this},pluck:function(t){return i.invoke(this.models,"get",t)},fetch:function(t){t=i.extend({parse:true},t);var e=t.success;var r=this;t.success=function(i){var s=t.reset?"reset":"set";r[s](i,t);if(e)e.call(t.context,r,i,t);r.trigger("sync",r,i,t)};q(this,t);return this.sync("read",this,t)},create:function(t,e){e=e?i.clone(e):{};var r=e.wait;t=this._prepareModel(t,e);if(!t)return false;if(!r)this.add(t,e);var s=this;var n=e.success;e.success=function(t,e,i){if(r)s.add(t,i);if(n)n.call(i.context,t,e,i)};t.save(null,e);return t},parse:function(t,e){return t},clone:function(){return new this.constructor(this.models,{model:this.model,comparator:this.comparator})},modelId:function(t){return t[this.model.prototype.idAttribute||"id"]},_reset:function(){this.length=0;this.models=[];this._byId={}},_prepareModel:function(t,e){if(this._isModel(t)){if(!t.collection)t.collection=this;return t}e=e?i.clone(e):{};e.collection=this;var r=new this.model(t,e);if(!r.validationError)return r;this.trigger("invalid",this,r.validationError,e);return false},_removeModels:function(t,e){var i=[];for(var r=0;r<t.length;r++){var s=this.get(t[r]);if(!s)continue;var n=this.indexOf(s);this.models.splice(n,1);this.length--;if(!e.silent){e.index=n;s.trigger("remove",s,this,e)}i.push(s);this._removeReference(s,e)}return i.length?i:false},_isModel:function(t){return t instanceof m},_addReference:function(t,e){this._byId[t.cid]=t;var i=this.modelId(t.attributes);if(i!=null)this._byId[i]=t;t.on("all",this._onModelEvent,this)},_removeReference:function(t,e){delete this._byId[t.cid];var i=this.modelId(t.attributes);if(i!=null)delete this._byId[i];if(this===t.collection)delete t.collection;t.off("all",this._onModelEvent,this)},_onModelEvent:function(t,e,i,r){if((t==="add"||t==="remove")&&i!==this)return;if(t==="destroy")this.remove(e,r);if(t==="change"){var s=this.modelId(e.previousAttributes());var n=this.modelId(e.attributes);if(s!==n){if(s!=null)delete this._byId[s];if(n!=null)this._byId[n]=e}}this.trigger.apply(this,arguments)}});var w={forEach:3,each:3,map:3,collect:3,reduce:4,foldl:4,inject:4,reduceRight:4,foldr:4,find:3,detect:3,filter:3,select:3,reject:3,every:3,all:3,some:3,any:3,include:2,contains:2,invoke:0,max:3,min:3,toArray:1,size:1,first:3,head:3,take:3,initial:3,rest:3,tail:3,drop:3,last:3,without:0,difference:0,indexOf:3,shuffle:1,lastIndexOf:3,isEmpty:1,chain:1,sample:3,partition:3};o(y,w,"models");var E=["groupBy","countBy","sortBy","indexBy"];i.each(E,function(t){if(!i[t])return;y.prototype[t]=function(e,r){var s=i.isFunction(e)?e:function(t){return t.get(e)};return i[t](this.models,s,r)}});var k=e.View=function(t){this.cid=i.uniqueId("view");i.extend(this,i.pick(t,I));this._ensureElement();this.initialize.apply(this,arguments)};var S=/^(\S+)\s*(.*)$/;var I=["model","collection","el","id","attributes","className","tagName","events"];i.extend(k.prototype,h,{tagName:"div",$:function(t){return this.$el.find(t)},initialize:function(){},render:function(){return this},remove:function(){this._removeElement();this.stopListening();return this},_removeElement:function(){this.$el.remove()},setElement:function(t){this.undelegateEvents();this._setElement(t);this.delegateEvents();return this},_setElement:function(t){this.$el=t instanceof e.$?t:e.$(t);this.el=this.$el[0]},delegateEvents:function(t){t||(t=i.result(this,"events"));if(!t)return this;this.undelegateEvents();for(var e in t){var r=t[e];if(!i.isFunction(r))r=this[r];if(!r)continue;var s=e.match(S);this.delegate(s[1],s[2],i.bind(r,this))}return this},delegate:function(t,e,i){this.$el.on(t+".delegateEvents"+this.cid,e,i);return this},undelegateEvents:function(){if(this.$el)this.$el.off(".delegateEvents"+this.cid);return this},undelegate:function(t,e,i){this.$el.off(t+".delegateEvents"+this.cid,e,i);return this},_createElement:function(t){return document.createElement(t)},_ensureElement:function(){if(!this.el){var t=i.extend({},i.result(this,"attributes"));if(this.id)t.id=i.result(this,"id");if(this.className)t["class"]=i.result(this,"className");this.setElement(this._createElement(i.result(this,"tagName")));this._setAttributes(t)}else{this.setElement(i.result(this,"el"))}},_setAttributes:function(t){this.$el.attr(t)}});e.sync=function(t,r,s){var n=T[t];i.defaults(s||(s={}),{emulateHTTP:e.emulateHTTP,emulateJSON:e.emulateJSON});var a={type:n,dataType:"json"};if(!s.url){a.url=i.result(r,"url")||M()}if(s.data==null&&r&&(t==="create"||t==="update"||t==="patch")){a.contentType="application/json";a.data=JSON.stringify(s.attrs||r.toJSON(s))}if(s.emulateJSON){a.contentType="application/x-www-form-urlencoded";a.data=a.data?{model:a.data}:{}}if(s.emulateHTTP&&(n==="PUT"||n==="DELETE"||n==="PATCH")){a.type="POST";if(s.emulateJSON)a.data._method=n;var o=s.beforeSend;s.beforeSend=function(t){t.setRequestHeader("X-HTTP-Method-Override",n);if(o)return o.apply(this,arguments)}}if(a.type!=="GET"&&!s.emulateJSON){a.processData=false}var h=s.error;s.error=function(t,e,i){s.textStatus=e;s.errorThrown=i;if(h)h.call(s.context,t,e,i)};var u=s.xhr=e.ajax(i.extend(a,s));r.trigger("request",r,u,s);return u};var T={create:"POST",update:"PUT",patch:"PATCH","delete":"DELETE",read:"GET"};e.ajax=function(){return e.$.ajax.apply(e.$,arguments)};var P=e.Router=function(t){t||(t={});if(t.routes)this.routes=t.routes;this._bindRoutes();this.initialize.apply(this,arguments)};var H=/\((.*?)\)/g;var $=/(\(\?)?:\w+/g;var A=/\*\w+/g;var C=/[\-{}\[\]+?.,\\\^$|#\s]/g;i.extend(P.prototype,h,{initialize:function(){},route:function(t,r,s){if(!i.isRegExp(t))t=this._routeToRegExp(t);if(i.isFunction(r)){s=r;r=""}if(!s)s=this[r];var n=this;e.history.route(t,function(i){var a=n._extractParameters(t,i);if(n.execute(s,a,r)!==false){n.trigger.apply(n,["route:"+r].concat(a));n.trigger("route",r,a);e.history.trigger("route",n,r,a)}});return this},execute:function(t,e,i){if(t)t.apply(this,e)},navigate:function(t,i){e.history.navigate(t,i);return this},_bindRoutes:function(){if(!this.routes)return;this.routes=i.result(this,"routes");var t,e=i.keys(this.routes);while((t=e.pop())!=null){this.route(t,this.routes[t])}},_routeToRegExp:function(t){t=t.replace(C,"\\$&").replace(H,"(?:$1)?").replace($,function(t,e){return e?t:"([^/?]+)"}).replace(A,"([^?]*?)");return new RegExp("^"+t+"(?:\\?([\\s\\S]*))?$")},_extractParameters:function(t,e){var r=t.exec(e).slice(1);return i.map(r,function(t,e){if(e===r.length-1)return t||null;return t?decodeURIComponent(t):null})}});var N=e.History=function(){this.handlers=[];i.bindAll(this,"checkUrl");if(typeof window!=="undefined"){this.location=window.location;this.history=window.history}};var R=/^[#\/]|\s+$/g;var j=/^\/+|\/+$/g;var O=/#.*$/;N.started=false;i.extend(N.prototype,h,{interval:50,atRoot:function(){var t=this.location.pathname.replace(/[^\/]$/,"$&/");return t===this.root&&!this.getSearch()},matchRoot:function(){var t=this.decodeFragment(this.location.pathname);var e=t.slice(0,this.root.length-1)+"/";return e===this.root},decodeFragment:function(t){return decodeURI(t.replace(/%25/g,"%2525"))},getSearch:function(){var t=this.location.href.replace(/#.*/,"").match(/\?.+/);return t?t[0]:""},getHash:function(t){var e=(t||this).location.href.match(/#(.*)$/);return e?e[1]:""},getPath:function(){var t=this.decodeFragment(this.location.pathname+this.getSearch()).slice(this.root.length-1);return t.charAt(0)==="/"?t.slice(1):t},getFragment:function(t){if(t==null){if(this._usePushState||!this._wantsHashChange){t=this.getPath()}else{t=this.getHash()}}return t.replace(R,"")},start:function(t){if(N.started)throw new Error("Backbone.history has already been started");N.started=true;this.options=i.extend({root:"/"},this.options,t);this.root=this.options.root;this._wantsHashChange=this.options.hashChange!==false;this._hasHashChange="onhashchange"in window;this._useHashChange=this._wantsHashChange&&this._hasHashChange;this._wantsPushState=!!this.options.pushState;this._hasPushState=!!(this.history&&this.history.pushState);this._usePushState=this._wantsPushState&&this._hasPushState;this.fragment=this.getFragment();this.root=("/"+this.root+"/").replace(j,"/");if(this._wantsHashChange&&this._wantsPushState){if(!this._hasPushState&&!this.atRoot()){var e=this.root.slice(0,-1)||"/";this.location.replace(e+"#"+this.getPath());return true}else if(this._hasPushState&&this.atRoot()){this.navigate(this.getHash(),{replace:true})}}if(!this._hasHashChange&&this._wantsHashChange&&!this._usePushState){this.iframe=document.createElement("iframe");this.iframe.src="javascript:0";this.iframe.style.display="none";this.iframe.tabIndex=-1;var r=document.body;var s=r.insertBefore(this.iframe,r.firstChild).contentWindow;s.document.open();s.document.close();s.location.hash="#"+this.fragment}var n=window.addEventListener||function(t,e){return attachEvent("on"+t,e)};if(this._usePushState){n("popstate",this.checkUrl,false)}else if(this._useHashChange&&!this.iframe){n("hashchange",this.checkUrl,false)}else if(this._wantsHashChange){this._checkUrlInterval=setInterval(this.checkUrl,this.interval)}if(!this.options.silent)return this.loadUrl()},stop:function(){var t=window.removeEventListener||function(t,e){return detachEvent("on"+t,e)};if(this._usePushState){t("popstate",this.checkUrl,false)}else if(this._useHashChange&&!this.iframe){t("hashchange",this.checkUrl,false)}if(this.iframe){document.body.removeChild(this.iframe);this.iframe=null}if(this._checkUrlInterval)clearInterval(this._checkUrlInterval);N.started=false},route:function(t,e){this.handlers.unshift({route:t,callback:e})},checkUrl:function(t){var e=this.getFragment();if(e===this.fragment&&this.iframe){e=this.getHash(this.iframe.contentWindow)}if(e===this.fragment)return false;if(this.iframe)this.navigate(e);this.loadUrl()},loadUrl:function(t){if(!this.matchRoot())return false;t=this.fragment=this.getFragment(t);return i.any(this.handlers,function(e){if(e.route.test(t)){e.callback(t);return true}})},navigate:function(t,e){if(!N.started)return false;if(!e||e===true)e={trigger:!!e};t=this.getFragment(t||"");var i=this.root;if(t===""||t.charAt(0)==="?"){i=i.slice(0,-1)||"/"}var r=i+t;t=this.decodeFragment(t.replace(O,""));if(this.fragment===t)return;this.fragment=t;if(this._usePushState){this.history[e.replace?"replaceState":"pushState"]({},document.title,r)}else if(this._wantsHashChange){this._updateHash(this.location,t,e.replace);if(this.iframe&&t!==this.getHash(this.iframe.contentWindow)){var s=this.iframe.contentWindow;if(!e.replace){s.document.open();s.document.close()}this._updateHash(s.location,t,e.replace)}}else{return this.location.assign(r)}if(e.trigger)return this.loadUrl(t)},_updateHash:function(t,e,i){if(i){var r=t.href.replace(/(javascript:|#).*$/,"");t.replace(r+"#"+e)}else{t.hash="#"+e}}});e.history=new N;var U=function(t,e){var r=this;var s;if(t&&i.has(t,"constructor")){s=t.constructor}else{s=function(){return r.apply(this,arguments)}}i.extend(s,r,e);var n=function(){this.constructor=s};n.prototype=r.prototype;s.prototype=new n;if(t)i.extend(s.prototype,t);s.__super__=r.prototype;return s};m.extend=y.extend=P.extend=k.extend=N.extend=U;var M=function(){throw new Error('A "url" property or function must be specified')};var q=function(t,e){var i=e.error;e.error=function(r){if(i)i.call(e.context,t,r,e);t.trigger("error",t,r,e)}};return e});
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o=function(t,e,r){i.each(e,function(e,n){if(i[n])t.prototype[n]=a(e,n,r)})};var h=function(t,e){if(i.isFunction(t))return t;if(i.isObject(t)&&!e._isModel(t))return u(t);if(i.isString(t))return function(e){return e.get(t)};return t};var u=function(t){var e=i.matches(t);return function(t){return e(t.attributes)}};var l=e.Events={};var c=/\s+/;var f=function(t,e,r,n,s){var a=0,o;if(r&&typeof r==="object"){if(n!==void 0&&"context"in s&&s.context===void 0)s.context=n;for(o=i.keys(r);a<o.length;a++){e=f(t,e,o[a],r[o[a]],s)}}else if(r&&c.test(r)){for(o=r.split(c);a<o.length;a++){e=t(e,o[a],n,s)}}else{e=t(e,r,n,s)}return e};l.on=function(t,e,i){return d(this,t,e,i)};var d=function(t,e,i,r,n){t._events=f(v,t._events||{},e,i,{context:r,ctx:t,listening:n});if(n){var s=t._listeners||(t._listeners={});s[n.id]=n}return t};l.listenTo=function(t,e,r){if(!t)return this;var n=t._listenId||(t._listenId=i.uniqueId("l"));var s=this._listeningTo||(this._listeningTo={});var a=s[n];if(!a){var o=this._listenId||(this._listenId=i.uniqueId("l"));a=s[n]={obj:t,objId:n,id:o,listeningTo:s,count:0}}d(t,e,r,this,a);return this};var v=function(t,e,i,r){if(i){var n=t[e]||(t[e]=[]);var s=r.context,a=r.ctx,o=r.listening;if(o)o.count++;n.push({callback:i,context:s,ctx:s||a,listening:o})}return t};l.off=function(t,e,i){if(!this._events)return this;this._events=f(g,this._events,t,e,{context:i,listeners:this._listeners});return this};l.stopListening=function(t,e,r){var n=this._listeningTo;if(!n)return this;var s=t?[t._listenId]:i.keys(n);for(var a=0;a<s.length;a++){var o=n[s[a]];if(!o)break;o.obj.off(e,r,this)}if(i.isEmpty(n))this._listeningTo=void 0;return this};var g=function(t,e,r,n){if(!t)return;var s=0,a;var o=n.context,h=n.listeners;if(!e&&!r&&!o){var u=i.keys(h);for(;s<u.length;s++){a=h[u[s]];delete h[a.id];delete a.listeningTo[a.objId]}return}var l=e?[e]:i.keys(t);for(;s<l.length;s++){e=l[s];var c=t[e];if(!c)break;var f=[];for(var d=0;d<c.length;d++){var v=c[d];if(r&&r!==v.callback&&r!==v.callback._callback||o&&o!==v.context){f.push(v)}else{a=v.listening;if(a&&--a.count===0){delete h[a.id];delete a.listeningTo[a.objId]}}}if(f.length){t[e]=f}else{delete t[e]}}if(i.size(t))return t};l.once=function(t,e,r){var n=f(p,{},t,e,i.bind(this.off,this));return this.on(n,void 0,r)};l.listenToOnce=function(t,e,r){var n=f(p,{},e,r,i.bind(this.stopListening,this,t));return this.listenTo(t,n)};var p=function(t,e,r,n){if(r){var s=t[e]=i.once(function(){n(e,s);r.apply(this,arguments)});s._callback=r}return t};l.trigger=function(t){if(!this._events)return this;var e=Math.max(0,arguments.length-1);var i=Array(e);for(var r=0;r<e;r++)i[r]=arguments[r+1];f(m,this._events,t,void 0,i);return this};var m=function(t,e,i,r){if(t){var n=t[e];var s=t.all;if(n&&s)s=s.slice();if(n)_(n,r);if(s)_(s,[e].concat(r))}return t};var _=function(t,e){var i,r=-1,n=t.length,s=e[0],a=e[1],o=e[2];switch(e.length){case 0:while(++r<n)(i=t[r]).callback.call(i.ctx);return;case 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this.attributes)e[r]=void 0;return this.set(e,i.extend({},t,{unset:true}))},hasChanged:function(t){if(t==null)return!i.isEmpty(this.changed);return i.has(this.changed,t)},changedAttributes:function(t){if(!t)return this.hasChanged()?i.clone(this.changed):false;var e=this._changing?this._previousAttributes:this.attributes;var r={};for(var n in t){var s=t[n];if(i.isEqual(e[n],s))continue;r[n]=s}return i.size(r)?r:false},previous:function(t){if(t==null||!this._previousAttributes)return null;return this._previousAttributes[t]},previousAttributes:function(){return i.clone(this._previousAttributes)},fetch:function(t){t=i.extend({parse:true},t);var e=this;var r=t.success;t.success=function(i){var n=t.parse?e.parse(i,t):i;if(!e.set(n,t))return false;if(r)r.call(t.context,e,i,t);e.trigger("sync",e,i,t)};z(this,t);return this.sync("read",this,t)},save:function(t,e,r){var n;if(t==null||typeof t==="object"){n=t;r=e}else{(n={})[t]=e}r=i.extend({validate:true,parse:true},r);var s=r.wait;if(n&&!s){if(!this.set(n,r))return false}else{if(!this._validate(n,r))return false}var a=this;var o=r.success;var h=this.attributes;r.success=function(t){a.attributes=h;var e=r.parse?a.parse(t,r):t;if(s)e=i.extend({},n,e);if(e&&!a.set(e,r))return false;if(o)o.call(r.context,a,t,r);a.trigger("sync",a,t,r)};z(this,r);if(n&&s)this.attributes=i.extend({},h,n);var u=this.isNew()?"create":r.patch?"patch":"update";if(u==="patch"&&!r.attrs)r.attrs=n;var l=this.sync(u,this,r);this.attributes=h;return l},destroy:function(t){t=t?i.clone(t):{};var e=this;var r=t.success;var n=t.wait;var s=function(){e.stopListening();e.trigger("destroy",e,e.collection,t)};t.success=function(i){if(n)s();if(r)r.call(t.context,e,i,t);if(!e.isNew())e.trigger("sync",e,i,t)};var a=false;if(this.isNew()){i.defer(t.success)}else{z(this,t);a=this.sync("delete",this,t)}if(!n)s();return a},url:function(){var t=i.result(this,"urlRoot")||i.result(this.collection,"url")||F();if(this.isNew())return t;var e=this.get(this.idAttribute);return t.replace(/[^\/]$/,"$&/")+encodeURIComponent(e)},parse:function(t,e){return t},clone:function(){return new this.constructor(this.attributes)},isNew:function(){return!this.has(this.idAttribute)},isValid:function(t){return this._validate({},i.defaults({validate:true},t))},_validate:function(t,e){if(!e.validate||!this.validate)return true;t=i.extend({},this.attributes,t);var r=this.validationError=this.validate(t,e)||null;if(!r)return true;this.trigger("invalid",this,r,i.extend(e,{validationError:r}));return false}});var b={keys:1,values:1,pairs:1,invert:1,pick:0,omit:0,chain:1,isEmpty:1};o(y,b,"attributes");var x=e.Collection=function(t,e){e||(e={});if(e.model)this.model=e.model;if(e.comparator!==void 0)this.comparator=e.comparator;this._reset();this.initialize.apply(this,arguments);if(t)this.reset(t,i.extend({silent:true},e))};var w={add:true,remove:true,merge:true};var E={add:true,remove:false};var k=function(t,e,i){i=Math.min(Math.max(i,0),t.length);var r=Array(t.length-i);var n=e.length;for(var s=0;s<r.length;s++)r[s]=t[s+i];for(s=0;s<n;s++)t[s+i]=e[s];for(s=0;s<r.length;s++)t[s+n+i]=r[s]};i.extend(x.prototype,l,{model:y,initialize:function(){},toJSON:function(t){return this.map(function(e){return e.toJSON(t)})},sync:function(){return e.sync.apply(this,arguments)},add:function(t,e){return this.set(t,i.extend({merge:false},e,E))},remove:function(t,e){e=i.extend({},e);var r=!i.isArray(t);t=r?[t]:i.clone(t);var n=this._removeModels(t,e);if(!e.silent&&n)this.trigger("update",this,e);return r?n[0]:n},set:function(t,e){if(t==null)return;e=i.defaults({},e,w);if(e.parse&&!this._isModel(t))t=this.parse(t,e);var r=!i.isArray(t);t=r?[t]:t.slice();var n=e.at;if(n!=null)n=+n;if(n<0)n+=this.length+1;var s=[];var a=[];var o=[];var h={};var u=e.add;var l=e.merge;var c=e.remove;var f=false;var d=this.comparator&&n==null&&e.sort!==false;var v=i.isString(this.comparator)?this.comparator:null;var g;for(var p=0;p<t.length;p++){g=t[p];var m=this.get(g);if(m){if(l&&g!==m){var _=this._isModel(g)?g.attributes:g;if(e.parse)_=m.parse(_,e);m.set(_,e);if(d&&!f)f=m.hasChanged(v)}if(!h[m.cid]){h[m.cid]=true;s.push(m)}t[p]=m}else if(u){g=t[p]=this._prepareModel(g,e);if(g){a.push(g);this._addReference(g,e);h[g.cid]=true;s.push(g)}}}if(c){for(p=0;p<this.length;p++){g=this.models[p];if(!h[g.cid])o.push(g)}if(o.length)this._removeModels(o,e)}var y=false;var b=!d&&u&&c;if(s.length&&b){y=this.length!=s.length||i.some(this.models,function(t,e){return t!==s[e]});this.models.length=0;k(this.models,s,0);this.length=this.models.length}else if(a.length){if(d)f=true;k(this.models,a,n==null?this.length:n);this.length=this.models.length}if(f)this.sort({silent:true});if(!e.silent){for(p=0;p<a.length;p++){if(n!=null)e.index=n+p;g=a[p];g.trigger("add",g,this,e)}if(f||y)this.trigger("sort",this,e);if(a.length||o.length)this.trigger("update",this,e)}return r?t[0]:t},reset:function(t,e){e=e?i.clone(e):{};for(var r=0;r<this.models.length;r++){this._removeReference(this.models[r],e)}e.previousModels=this.models;this._reset();t=this.add(t,i.extend({silent:true},e));if(!e.silent)this.trigger("reset",this,e);return t},push:function(t,e){return this.add(t,i.extend({at:this.length},e))},pop:function(t){var e=this.at(this.length-1);return this.remove(e,t)},unshift:function(t,e){return this.add(t,i.extend({at:0},e))},shift:function(t){var e=this.at(0);return this.remove(e,t)},slice:function(){return s.apply(this.models,arguments)},get:function(t){if(t==null)return void 0;var e=this.modelId(this._isModel(t)?t.attributes:t);return this._byId[t]||this._byId[e]||this._byId[t.cid]},at:function(t){if(t<0)t+=this.length;return this.models[t]},where:function(t,e){return this[e?"find":"filter"](t)},findWhere:function(t){return this.where(t,true)},sort:function(t){var e=this.comparator;if(!e)throw new Error("Cannot sort a set without a 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diff --git a/core/assets/vendor/backbone/backbone-min.map b/core/assets/vendor/backbone/backbone-min.map
index f01489a..b728f9b 100644
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\ No newline at end of file
diff --git a/core/assets/vendor/backbone/backbone.js b/core/assets/vendor/backbone/backbone.js
index 5880042..c924965 100644
--- a/core/assets/vendor/backbone/backbone.js
+++ b/core/assets/vendor/backbone/backbone.js
@@ -1,4 +1,4 @@
-//     Backbone.js 1.2.1
+//     Backbone.js 1.2.3
 
 //     (c) 2010-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
 //     Backbone may be freely distributed under the MIT license.
@@ -41,10 +41,10 @@
   var previousBackbone = root.Backbone;
 
   // Create a local reference to a common array method we'll want to use later.
-  var slice = [].slice;
+  var slice = Array.prototype.slice;
 
   // Current version of the library. Keep in sync with `package.json`.
-  Backbone.VERSION = '1.2.1';
+  Backbone.VERSION = '1.2.3';
 
   // For Backbone's purposes, jQuery, Zepto, Ender, or My Library (kidding) owns
   // the `$` variable.
@@ -68,8 +68,13 @@
   // form param named `model`.
   Backbone.emulateJSON = false;
 
-  // Proxy Underscore methods to a Backbone class' prototype using a
-  // particular attribute as the data argument
+  // Proxy Backbone class methods to Underscore functions, wrapping the model's
+  // `attributes` object or collection's `models` array behind the scenes.
+  //
+  // collection.filter(function(model) { return model.get('age') > 10 });
+  // collection.each(this.addView);
+  //
+  // `Function#apply` can be slow so we use the method's arg count, if we know it.
   var addMethod = function(length, method, attribute) {
     switch (length) {
       case 1: return function() {
@@ -79,10 +84,10 @@
         return _[method](this[attribute], value);
       };
       case 3: return function(iteratee, context) {
-        return _[method](this[attribute], iteratee, context);
+        return _[method](this[attribute], cb(iteratee, this), context);
       };
       case 4: return function(iteratee, defaultVal, context) {
-        return _[method](this[attribute], iteratee, defaultVal, context);
+        return _[method](this[attribute], cb(iteratee, this), defaultVal, context);
       };
       default: return function() {
         var args = slice.call(arguments);
@@ -97,12 +102,26 @@
     });
   };
 
+  // Support `collection.sortBy('attr')` and `collection.findWhere({id: 1})`.
+  var cb = function(iteratee, instance) {
+    if (_.isFunction(iteratee)) return iteratee;
+    if (_.isObject(iteratee) && !instance._isModel(iteratee)) return modelMatcher(iteratee);
+    if (_.isString(iteratee)) return function(model) { return model.get(iteratee); };
+    return iteratee;
+  };
+  var modelMatcher = function(attrs) {
+    var matcher = _.matches(attrs);
+    return function(model) {
+      return matcher(model.attributes);
+    };
+  };
+
   // Backbone.Events
   // ---------------
 
   // A module that can be mixed in to *any object* in order to provide it with
-  // custom events. You may bind with `on` or remove with `off` callback
-  // functions to an event; `trigger`-ing an event fires all callbacks in
+  // a custom event channel. You may bind a callback to an event with `on` or
+  // remove with `off`; `trigger`-ing an event fires all callbacks in
   // succession.
   //
   //     var object = {};
@@ -117,26 +136,25 @@
 
   // Iterates over the standard `event, callback` (as well as the fancy multiple
   // space-separated events `"change blur", callback` and jQuery-style event
-  // maps `{event: callback}`), reducing them by manipulating `memo`.
-  // Passes a normalized single event name and callback, as well as any
-  // optional `opts`.
-  var eventsApi = function(iteratee, memo, name, callback, opts) {
+  // maps `{event: callback}`).
+  var eventsApi = function(iteratee, events, name, callback, opts) {
     var i = 0, names;
     if (name && typeof name === 'object') {
       // Handle event maps.
       if (callback !== void 0 && 'context' in opts && opts.context === void 0) opts.context = callback;
       for (names = _.keys(name); i < names.length ; i++) {
-        memo = iteratee(memo, names[i], name[names[i]], opts);
+        events = eventsApi(iteratee, events, names[i], name[names[i]], opts);
       }
     } else if (name && eventSplitter.test(name)) {
-      // Handle space separated event names.
+      // Handle space separated event names by delegating them individually.
       for (names = name.split(eventSplitter); i < names.length; i++) {
-        memo = iteratee(memo, names[i], callback, opts);
+        events = iteratee(events, names[i], callback, opts);
       }
     } else {
-      memo = iteratee(memo, name, callback, opts);
+      // Finally, standard events.
+      events = iteratee(events, name, callback, opts);
     }
-    return memo;
+    return events;
   };
 
   // Bind an event to a `callback` function. Passing `"all"` will bind
@@ -145,8 +163,7 @@
     return internalOn(this, name, callback, context);
   };
 
-  // An internal use `on` function, used to guard the `listening` argument from
-  // the public API.
+  // Guard the `listening` argument from the public API.
   var internalOn = function(obj, name, callback, context, listening) {
     obj._events = eventsApi(onApi, obj._events || {}, name, callback, {
         context: context,
@@ -163,7 +180,8 @@
   };
 
   // Inversion-of-control versions of `on`. Tell *this* object to listen to
-  // an event in another object... keeping track of what it's listening to.
+  // an event in another object... keeping track of what it's listening to
+  // for easier unbinding later.
   Events.listenTo =  function(obj, name, callback) {
     if (!obj) return this;
     var id = obj._listenId || (obj._listenId = _.uniqueId('l'));
@@ -231,7 +249,6 @@
 
   // The reducing API that removes a callback from the `events` object.
   var offApi = function(events, name, callback, options) {
-    // No events to consider.
     if (!events) return;
 
     var i = 0, listening;
@@ -286,9 +303,9 @@
   };
 
   // Bind an event to only be triggered a single time. After the first time
-  // the callback is invoked, it will be removed. When multiple events are
-  // passed in using the space-separated syntax, the event will fire once for every
-  // event you passed in, not once for a combination of all events
+  // the callback is invoked, its listener will be removed. If multiple events
+  // are passed in using the space-separated syntax, the handler will fire
+  // once for each event, not once for a combination of all events.
   Events.once =  function(name, callback, context) {
     // Map the event into a `{event: once}` object.
     var events = eventsApi(onceMap, {}, name, callback, _.bind(this.off, this));
@@ -476,9 +493,6 @@
       var changed = this.changed;
       var prev    = this._previousAttributes;
 
-      // Check for changes of `id`.
-      if (this.idAttribute in attrs) this.id = attrs[this.idAttribute];
-
       // For each `set` attribute, update or delete the current value.
       for (var attr in attrs) {
         val = attrs[attr];
@@ -491,6 +505,9 @@
         unset ? delete current[attr] : current[attr] = val;
       }
 
+      // Update the `id`.
+      this.id = this.get(this.idAttribute);
+
       // Trigger all relevant attribute changes.
       if (!silent) {
         if (changes.length) this._pending = options;
@@ -713,7 +730,8 @@
 
   });
 
-  // Underscore methods that we want to implement on the Model.
+  // Underscore methods that we want to implement on the Model, mapped to the
+  // number of arguments they take.
   var modelMethods = { keys: 1, values: 1, pairs: 1, invert: 1, pick: 0,
       omit: 0, chain: 1, isEmpty: 1 };
 
@@ -746,6 +764,16 @@
   var setOptions = {add: true, remove: true, merge: true};
   var addOptions = {add: true, remove: false};
 
+  // Splices `insert` into `array` at index `at`.
+  var splice = function(array, insert, at) {
+    at = Math.min(Math.max(at, 0), array.length);
+    var tail = Array(array.length - at);
+    var length = insert.length;
+    for (var i = 0; i < tail.length; i++) tail[i] = array[i + at];
+    for (i = 0; i < length; i++) array[i + at] = insert[i];
+    for (i = 0; i < tail.length; i++) array[i + length + at] = tail[i];
+  };
+
   // Define the Collection's inheritable methods.
   _.extend(Collection.prototype, Events, {
 
@@ -768,7 +796,9 @@
       return Backbone.sync.apply(this, arguments);
     },
 
-    // Add a model, or list of models to the set.
+    // Add a model, or list of models to the set. `models` may be Backbone
+    // Models or raw JavaScript objects to be converted to Models, or any
+    // combination of the two.
     add: function(models, options) {
       return this.set(models, _.extend({merge: false}, options, addOptions));
     },
@@ -788,83 +818,88 @@
     // already exist in the collection, as necessary. Similar to **Model#set**,
     // the core operation for updating the data contained by the collection.
     set: function(models, options) {
+      if (models == null) return;
+
       options = _.defaults({}, options, setOptions);
       if (options.parse && !this._isModel(models)) models = this.parse(models, options);
+
       var singular = !_.isArray(models);
-      models = singular ? (models ? [models] : []) : models.slice();
-      var id, model, attrs, existing, sort;
+      models = singular ? [models] : models.slice();
+
       var at = options.at;
       if (at != null) at = +at;
       if (at < 0) at += this.length + 1;
+
+      var set = [];
+      var toAdd = [];
+      var toRemove = [];
+      var modelMap = {};
+
+      var add = options.add;
+      var merge = options.merge;
+      var remove = options.remove;
+
+      var sort = false;
       var sortable = this.comparator && (at == null) && options.sort !== false;
       var sortAttr = _.isString(this.comparator) ? this.comparator : null;
-      var toAdd = [], toRemove = [], modelMap = {};
-      var add = options.add, merge = options.merge, remove = options.remove;
-      var order = !sortable && add && remove ? [] : false;
-      var orderChanged = false;
 
       // Turn bare objects into model references, and prevent invalid models
       // from being added.
+      var model;
       for (var i = 0; i < models.length; i++) {
-        attrs = models[i];
+        model = models[i];
 
         // If a duplicate is found, prevent it from being added and
         // optionally merge it into the existing model.
-        if (existing = this.get(attrs)) {
-          if (remove) modelMap[existing.cid] = true;
-          if (merge && attrs !== existing) {
-            attrs = this._isModel(attrs) ? attrs.attributes : attrs;
+        var existing = this.get(model);
+        if (existing) {
+          if (merge && model !== existing) {
+            var attrs = this._isModel(model) ? model.attributes : model;
             if (options.parse) attrs = existing.parse(attrs, options);
             existing.set(attrs, options);
-            if (sortable && !sort && existing.hasChanged(sortAttr)) sort = true;
+            if (sortable && !sort) sort = existing.hasChanged(sortAttr);
+          }
+          if (!modelMap[existing.cid]) {
+            modelMap[existing.cid] = true;
+            set.push(existing);
           }
           models[i] = existing;
 
         // If this is a new, valid model, push it to the `toAdd` list.
         } else if (add) {
-          model = models[i] = this._prepareModel(attrs, options);
-          if (!model) continue;
-          toAdd.push(model);
-          this._addReference(model, options);
-        }
-
-        // Do not add multiple models with the same `id`.
-        model = existing || model;
-        if (!model) continue;
-        id = this.modelId(model.attributes);
-        if (order && (model.isNew() || !modelMap[id])) {
-          order.push(model);
-
-          // Check to see if this is actually a new model at this index.
-          orderChanged = orderChanged || !this.models[i] || model.cid !== this.models[i].cid;
+          model = models[i] = this._prepareModel(model, options);
+          if (model) {
+            toAdd.push(model);
+            this._addReference(model, options);
+            modelMap[model.cid] = true;
+            set.push(model);
+          }
         }
-
-        modelMap[id] = true;
       }
 
-      // Remove nonexistent models if appropriate.
+      // Remove stale models.
       if (remove) {
-        for (var i = 0; i < this.length; i++) {
-          if (!modelMap[(model = this.models[i]).cid]) toRemove.push(model);
+        for (i = 0; i < this.length; i++) {
+          model = this.models[i];
+          if (!modelMap[model.cid]) toRemove.push(model);
         }
         if (toRemove.length) this._removeModels(toRemove, options);
       }
 
       // See if sorting is needed, update `length` and splice in new models.
-      if (toAdd.length || orderChanged) {
+      var orderChanged = false;
+      var replace = !sortable && add && remove;
+      if (set.length && replace) {
+        orderChanged = this.length != set.length || _.some(this.models, function(model, index) {
+          return model !== set[index];
+        });
+        this.models.length = 0;
+        splice(this.models, set, 0);
+        this.length = this.models.length;
+      } else if (toAdd.length) {
         if (sortable) sort = true;
-        this.length += toAdd.length;
-        if (at != null) {
-          for (var i = 0; i < toAdd.length; i++) {
-            this.models.splice(at + i, 0, toAdd[i]);
-          }
-        } else {
-          if (order) this.models.length = 0;
-          var orderedModels = order || toAdd;
-          for (var i = 0; i < orderedModels.length; i++) {
-            this.models.push(orderedModels[i]);
-          }
-        }
+        splice(this.models, toAdd, at == null ? this.length : at);
+        this.length = this.models.length;
       }
 
       // Silently sort the collection if appropriate.
@@ -872,10 +907,10 @@
 
       // Unless silenced, it's time to fire all appropriate add/sort events.
       if (!options.silent) {
-        var addOpts = at != null ? _.clone(options) : options;
-        for (var i = 0; i < toAdd.length; i++) {
-          if (at != null) addOpts.index = at + i;
-          (model = toAdd[i]).trigger('add', model, this, addOpts);
+        for (i = 0; i < toAdd.length; i++) {
+          if (at != null) options.index = at + i;
+          model = toAdd[i];
+          model.trigger('add', model, this, options);
         }
         if (sort || orderChanged) this.trigger('sort', this, options);
         if (toAdd.length || toRemove.length) this.trigger('update', this, options);
@@ -944,10 +979,7 @@
     // Return models with matching attributes. Useful for simple cases of
     // `filter`.
     where: function(attrs, first) {
-      var matches = _.matches(attrs);
-      return this[first ? 'find' : 'filter'](function(model) {
-        return matches(model.attributes);
-      });
+      return this[first ? 'find' : 'filter'](attrs);
     },
 
     // Return the first model with matching attributes. Useful for simple cases
@@ -960,16 +992,19 @@
     // normal circumstances, as the set will maintain sort order as each item
     // is added.
     sort: function(options) {
-      if (!this.comparator) throw new Error('Cannot sort a set without a comparator');
+      var comparator = this.comparator;
+      if (!comparator) throw new Error('Cannot sort a set without a comparator');
       options || (options = {});
 
+      var length = comparator.length;
+      if (_.isFunction(comparator)) comparator = _.bind(comparator, this);
+
       // Run sort based on type of `comparator`.
-      if (_.isString(this.comparator) || this.comparator.length === 1) {
-        this.models = this.sortBy(this.comparator, this);
+      if (length === 1 || _.isString(comparator)) {
+        this.models = this.sortBy(comparator);
       } else {
-        this.models.sort(_.bind(this.comparator, this));
+        this.models.sort(comparator);
       }
-
       if (!options.silent) this.trigger('sort', this, options);
       return this;
     },
@@ -1058,7 +1093,6 @@
     },
 
     // Internal method called by both remove and set.
-    // Returns removed models, or false if nothing is removed.
     _removeModels: function(models, options) {
       var removed = [];
       for (var i = 0; i < models.length; i++) {
@@ -1128,29 +1162,16 @@
   // right here:
   var collectionMethods = { forEach: 3, each: 3, map: 3, collect: 3, reduce: 4,
       foldl: 4, inject: 4, reduceRight: 4, foldr: 4, find: 3, detect: 3, filter: 3,
-      select: 3, reject: 3, every: 3, all: 3, some: 3, any: 3, include: 2,
-      contains: 2, invoke: 0, max: 3, min: 3, toArray: 1, size: 1, first: 3,
+      select: 3, reject: 3, every: 3, all: 3, some: 3, any: 3, include: 3, includes: 3,
+      contains: 3, invoke: 0, max: 3, min: 3, toArray: 1, size: 1, first: 3,
       head: 3, take: 3, initial: 3, rest: 3, tail: 3, drop: 3, last: 3,
       without: 0, difference: 0, indexOf: 3, shuffle: 1, lastIndexOf: 3,
-      isEmpty: 1, chain: 1, sample: 3, partition: 3 };
+      isEmpty: 1, chain: 1, sample: 3, partition: 3, groupBy: 3, countBy: 3,
+      sortBy: 3, indexBy: 3};
 
   // Mix in each Underscore method as a proxy to `Collection#models`.
   addUnderscoreMethods(Collection, collectionMethods, 'models');
 
-  // Underscore methods that take a property name as an argument.
-  var attributeMethods = ['groupBy', 'countBy', 'sortBy', 'indexBy'];
-
-  // Use attributes instead of properties.
-  _.each(attributeMethods, function(method) {
-    if (!_[method]) return;
-    Collection.prototype[method] = function(value, context) {
-      var iterator = _.isFunction(value) ? value : function(model) {
-        return model.get(value);
-      };
-      return _[method](this.models, iterator, context);
-    };
-  });
-
   // Backbone.View
   // -------------
 
@@ -1174,7 +1195,7 @@
   // Cached regex to split keys for `delegate`.
   var delegateEventSplitter = /^(\S+)\s*(.*)$/;
 
-  // List of view options to be merged as properties.
+  // List of view options to be set as properties.
   var viewOptions = ['model', 'collection', 'el', 'id', 'attributes', 'className', 'tagName', 'events'];
 
   // Set up all inheritable **Backbone.View** properties and methods.
@@ -1518,7 +1539,7 @@
   // falls back to polling.
   var History = Backbone.History = function() {
     this.handlers = [];
-    _.bindAll(this, 'checkUrl');
+    this.checkUrl = _.bind(this.checkUrl, this);
 
     // Ensure that `History` can be used outside of the browser.
     if (typeof window !== 'undefined') {
@@ -1611,7 +1632,7 @@
       this.options          = _.extend({root: '/'}, this.options, options);
       this.root             = this.options.root;
       this._wantsHashChange = this.options.hashChange !== false;
-      this._hasHashChange   = 'onhashchange' in window;
+      this._hasHashChange   = 'onhashchange' in window && (document.documentMode === void 0 || document.documentMode > 7);
       this._useHashChange   = this._wantsHashChange && this._hasHashChange;
       this._wantsPushState  = !!this.options.pushState;
       this._hasPushState    = !!(this.history && this.history.pushState);
@@ -1730,7 +1751,7 @@
       // If the root doesn't match, no routes can match either.
       if (!this.matchRoot()) return false;
       fragment = this.fragment = this.getFragment(fragment);
-      return _.any(this.handlers, function(handler) {
+      return _.some(this.handlers, function(handler) {
         if (handler.route.test(fragment)) {
           handler.callback(fragment);
           return true;
diff --git a/core/core.libraries.yml b/core/core.libraries.yml
index 92b3f43..fd675e5 100644
--- a/core/core.libraries.yml
+++ b/core/core.libraries.yml
@@ -2,10 +2,10 @@
 
 backbone:
   remote: https://github.com/jashkenas/backbone
-  version: "1.2.1"
+  version: "1.2.3"
   license:
     name: MIT
-    url: https://github.com/jashkenas/backbone/blob/1.2.1/LICENSE
+    url: https://github.com/jashkenas/backbone/blob/1.2.3/LICENSE
     gpl-compatible: true
   js:
     assets/vendor/backbone/backbone-min.js: { weight: -19, minified: true }
diff --git a/core/modules/system/src/Tests/Common/AttachedAssetsTest.php b/core/modules/system/src/Tests/Common/AttachedAssetsTest.php
index 43f2ef9..7bbcafb 100644
--- a/core/modules/system/src/Tests/Common/AttachedAssetsTest.php
+++ b/core/modules/system/src/Tests/Common/AttachedAssetsTest.php
@@ -288,7 +288,7 @@ function testVersionQueryString() {
     $js_render_array = \Drupal::service('asset.js.collection_renderer')->render($js);
 
     $rendered_js = $this->renderer->renderPlain($js_render_array);
-    $this->assertTrue(strpos($rendered_js, 'core/assets/vendor/backbone/backbone-min.js?v=1.2.1') > 0 && strpos($rendered_js, 'core/assets/vendor/domready/ready.min.js?v=1.0.8') > 0 , 'JavaScript version identifiers correctly appended to URLs');
+    $this->assertTrue(strpos($rendered_js, 'core/assets/vendor/backbone/backbone-min.js?v=1.2.3') > 0 && strpos($rendered_js, 'core/assets/vendor/domready/ready.min.js?v=1.0.8') > 0 , 'JavaScript version identifiers correctly appended to URLs');
   }
 
   /**
