diff --git a/core/assets/vendor/classList/README.md b/core/assets/vendor/classList/README.md
deleted file mode 100644
index dd7359c..0000000
--- a/core/assets/vendor/classList/README.md
+++ /dev/null
@@ -1,7 +0,0 @@
-classList.js is a cross-browser JavaScript shim that fully implements `element.classList`. Refer to [the MDN page on `element.classList`][1] for more information.
-
-
-![Tracking image](https://in.getclicky.com/212712ns.gif)
-
-
-  [1]: https://developer.mozilla.org/en/DOM/element.classList "MDN / DOM / element.classList"
diff --git a/core/assets/vendor/classList/classList.js b/core/assets/vendor/classList/classList.js
deleted file mode 100644
index 1faaec8..0000000
--- a/core/assets/vendor/classList/classList.js
+++ /dev/null
@@ -1,179 +0,0 @@
-/*
- * classList.js: Cross-browser full element.classList implementation.
- * 2012-11-15
- *
- * By Eli Grey, http://eligrey.com
- * Public Domain.
- * NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
- */
-
-/*global self, document, DOMException */
-
-/*! @source http://purl.eligrey.com/github/classList.js/blob/master/classList.js*/
-
-if ("document" in self && !(
-		"classList" in document.createElement("_") &&
-		"classList" in document.createElementNS("http://www.w3.org/2000/svg", "svg")
-	)) {
-
-(function (view) {
-
-"use strict";
-
-if (!('Element' in view)) return;
-
-var
-	  classListProp = "classList"
-	, protoProp = "prototype"
-	, elemCtrProto = view.Element[protoProp]
-	, objCtr = Object
-	, strTrim = String[protoProp].trim || function () {
-		return this.replace(/^\s+|\s+$/g, "");
-	}
-	, arrIndexOf = Array[protoProp].indexOf || function (item) {
-		var
-			  i = 0
-			, len = this.length
-		;
-		for (; i < len; i++) {
-			if (i in this && this[i] === item) {
-				return i;
-			}
-		}
-		return -1;
-	}
-	// Vendors: please allow content code to instantiate DOMExceptions
-	, DOMEx = function (type, message) {
-		this.name = type;
-		this.code = DOMException[type];
-		this.message = message;
-	}
-	, checkTokenAndGetIndex = function (classList, token) {
-		if (token === "") {
-			throw new DOMEx(
-				  "SYNTAX_ERR"
-				, "An invalid or illegal string was specified"
-			);
-		}
-		if (/\s/.test(token)) {
-			throw new DOMEx(
-				  "INVALID_CHARACTER_ERR"
-				, "String contains an invalid character"
-			);
-		}
-		return arrIndexOf.call(classList, token);
-	}
-	, ClassList = function (elem) {
-		var
-			  trimmedClasses = strTrim.call(elem.getAttribute("class") || "")
-			, classes = trimmedClasses ? trimmedClasses.split(/\s+/) : []
-			, i = 0
-			, len = classes.length
-		;
-		for (; i < len; i++) {
-			this.push(classes[i]);
-		}
-		this._updateClassName = function () {
-			elem.setAttribute("class", this.toString());
-		};
-	}
-	, classListProto = ClassList[protoProp] = []
-	, classListGetter = function () {
-		return new ClassList(this);
-	}
-;
-// Most DOMException implementations don't allow calling DOMException's toString()
-// on non-DOMExceptions. Error's toString() is sufficient here.
-DOMEx[protoProp] = Error[protoProp];
-classListProto.item = function (i) {
-	return this[i] || null;
-};
-classListProto.contains = function (token) {
-	token += "";
-	return checkTokenAndGetIndex(this, token) !== -1;
-};
-classListProto.add = function () {
-	var
-		  tokens = arguments
-		, i = 0
-		, l = tokens.length
-		, token
-		, updated = false
-	;
-	do {
-		token = tokens[i] + "";
-		if (checkTokenAndGetIndex(this, token) === -1) {
-			this.push(token);
-			updated = true;
-		}
-	}
-	while (++i < l);
-
-	if (updated) {
-		this._updateClassName();
-	}
-};
-classListProto.remove = function () {
-	var
-		  tokens = arguments
-		, i = 0
-		, l = tokens.length
-		, token
-		, updated = false
-	;
-	do {
-		token = tokens[i] + "";
-		var index = checkTokenAndGetIndex(this, token);
-		if (index !== -1) {
-			this.splice(index, 1);
-			updated = true;
-		}
-	}
-	while (++i < l);
-
-	if (updated) {
-		this._updateClassName();
-	}
-};
-classListProto.toggle = function (token, forse) {
-	token += "";
-
-	var
-		  result = this.contains(token)
-		, method = result ?
-			forse !== true && "remove"
-		:
-			forse !== false && "add"
-	;
-
-	if (method) {
-		this[method](token);
-	}
-
-	return !result;
-};
-classListProto.toString = function () {
-	return this.join(" ");
-};
-
-if (objCtr.defineProperty) {
-	var classListPropDesc = {
-		  get: classListGetter
-		, enumerable: true
-		, configurable: true
-	};
-	try {
-		objCtr.defineProperty(elemCtrProto, classListProp, classListPropDesc);
-	} catch (ex) { // IE 8 doesn't support enumerable:true
-		if (ex.number === -0x7FF5EC54) {
-			classListPropDesc.enumerable = false;
-			objCtr.defineProperty(elemCtrProto, classListProp, classListPropDesc);
-		}
-	}
-} else if (objCtr[protoProp].__defineGetter__) {
-	elemCtrProto.__defineGetter__(classListProp, classListGetter);
-}
-
-}(self));
-
-}
diff --git a/core/assets/vendor/classList/classList.min.js b/core/assets/vendor/classList/classList.min.js
index fa98825..99b828c 100644
--- a/core/assets/vendor/classList/classList.min.js
+++ b/core/assets/vendor/classList/classList.min.js
@@ -1,2 +1,2 @@
-/*! @source http://purl.eligrey.com/github/classList.js/blob/master/classList.js*/
-if("document" in self&&!("classList" in document.createElement("_")&&"classList" in document.createElementNS("http://www.w3.org/2000/svg","svg"))){(function(j){"use strict";if(!("Element" in j)){return}var a="classList",f="prototype",m=j.Element[f],b=Object,k=String[f].trim||function(){return this.replace(/^\s+|\s+$/g,"")},c=Array[f].indexOf||function(q){var p=0,o=this.length;for(;p<o;p++){if(p in this&&this[p]===q){return p}}return -1},n=function(o,p){this.name=o;this.code=DOMException[o];this.message=p},g=function(p,o){if(o===""){throw new n("SYNTAX_ERR","An invalid or illegal string was specified")}if(/\s/.test(o)){throw new n("INVALID_CHARACTER_ERR","String contains an invalid character")}return c.call(p,o)},d=function(s){var r=k.call(s.getAttribute("class")),q=r?r.split(/\s+/):[],p=0,o=q.length;for(;p<o;p++){this.push(q[p])}this._updateClassName=function(){s.setAttribute("class",this.toString())}},e=d[f]=[],i=function(){return new d(this)};n[f]=Error[f];e.item=function(o){return this[o]||null};e.contains=function(o){o+="";return g(this,o)!==-1};e.add=function(){var s=arguments,r=0,p=s.length,q,o=false;do{q=s[r]+"";if(g(this,q)===-1){this.push(q);o=true}}while(++r<p);if(o){this._updateClassName()}};e.remove=function(){var t=arguments,s=0,p=t.length,r,o=false;do{r=t[s]+"";var q=g(this,r);if(q!==-1){this.splice(q,1);o=true}}while(++s<p);if(o){this._updateClassName()}};e.toggle=function(p,q){p+="";var o=this.contains(p),r=o?q!==true&&"remove":q!==false&&"add";if(r){this[r](p)}return !o};e.toString=function(){return this.join(" ")};if(b.defineProperty){var l={get:i,enumerable:true,configurable:true};try{b.defineProperty(m,a,l)}catch(h){if(h.number===-2146823252){l.enumerable=false;b.defineProperty(m,a,l)}}}else{if(b[f].__defineGetter__){m.__defineGetter__(a,i)}}}(self))};
+/*! @source http://purl.eligrey.com/github/classList.js/blob/master/classList.js */
+if("document" in self){if(!("classList" in document.createElement("_"))){(function(j){"use strict";if(!("Element" in j)){return}var a="classList",f="prototype",m=j.Element[f],b=Object,k=String[f].trim||function(){return this.replace(/^\s+|\s+$/g,"")},c=Array[f].indexOf||function(q){var p=0,o=this.length;for(;p<o;p++){if(p in this&&this[p]===q){return p}}return -1},n=function(o,p){this.name=o;this.code=DOMException[o];this.message=p},g=function(p,o){if(o===""){throw new n("SYNTAX_ERR","An invalid or illegal string was specified")}if(/\s/.test(o)){throw new n("INVALID_CHARACTER_ERR","String contains an invalid character")}return c.call(p,o)},d=function(s){var r=k.call(s.getAttribute("class")||""),q=r?r.split(/\s+/):[],p=0,o=q.length;for(;p<o;p++){this.push(q[p])}this._updateClassName=function(){s.setAttribute("class",this.toString())}},e=d[f]=[],i=function(){return new d(this)};n[f]=Error[f];e.item=function(o){return this[o]||null};e.contains=function(o){o+="";return g(this,o)!==-1};e.add=function(){var s=arguments,r=0,p=s.length,q,o=false;do{q=s[r]+"";if(g(this,q)===-1){this.push(q);o=true}}while(++r<p);if(o){this._updateClassName()}};e.remove=function(){var t=arguments,s=0,p=t.length,r,o=false,q;do{r=t[s]+"";q=g(this,r);while(q!==-1){this.splice(q,1);o=true;q=g(this,r)}}while(++s<p);if(o){this._updateClassName()}};e.toggle=function(p,q){p+="";var o=this.contains(p),r=o?q!==true&&"remove":q!==false&&"add";if(r){this[r](p)}if(q===true||q===false){return q}else{return !o}};e.toString=function(){return this.join(" ")};if(b.defineProperty){var l={get:i,enumerable:true,configurable:true};try{b.defineProperty(m,a,l)}catch(h){if(h.number===-2146823252){l.enumerable=false;b.defineProperty(m,a,l)}}}else{if(b[f].__defineGetter__){m.__defineGetter__(a,i)}}}(self))}else{(function(){var b=document.createElement("_");b.classList.add("c1","c2");if(!b.classList.contains("c2")){var c=function(e){var d=DOMTokenList.prototype[e];DOMTokenList.prototype[e]=function(h){var g,f=arguments.length;for(g=0;g<f;g++){h=arguments[g];d.call(this,h)}}};c("add");c("remove")}b.classList.toggle("c3",false);if(b.classList.contains("c3")){var a=DOMTokenList.prototype.toggle;DOMTokenList.prototype.toggle=function(d,e){if(1 in arguments&&!this.contains(d)===!e){return e}else{return a.call(this,d)}}}b=null}())}};
\ No newline at end of file
diff --git a/core/core.libraries.yml b/core/core.libraries.yml
index e6500ae..1a36202 100644
--- a/core/core.libraries.yml
+++ b/core/core.libraries.yml
@@ -14,11 +14,10 @@ backbone:
 
 classList:
   remote: https://github.com/eligrey/classList.js
-  # @todo Stable release required for Drupal 8.0.
-  version: master
+  version: 2014-12-13
   license:
     name: Public Domain
-    url: https://github.com/eligrey/classList.js/blob/master/LICENSE.md
+    url: https://github.com/eligrey/classList.js/blob/2014-12-13/LICENSE.md
     gpl-compatible: true
   js:
     assets/vendor/classList/classList.min.js: { weight: -21, browsers: { IE: 'lte IE 9', '!IE': false }, minified: true }