sparql 7.x-2.0-alpha2

- #1234584 by linclark: Fixed notices in sparql_registry_load_by_uri().
- #1210582 by linclark: Changed Add support for URL parameters.
- #1222066 by cwells73 | linclark: Changed SPARQL package's directory structure.
- #1209598 by cwells73: Fixed access control on sparql endpoint.
- #1214510 by linclark: Changed 'endpoint' property to 'uri' on endpoint objects.
- #1213192 by linclark: Changed SPARQL Registry field integration unnecessary.
- #847142 by linclark | JeremyFrench, stuarttaylor: Added error reporting to _sparql_request().
- #1212996 by scor: remove old code which was used to pass Drupal's prefixes to ARC2 SPARQL endpoint
Issue #1211898 by linclark: Changed API to take endpoint object instead of $endpoint + $options.
#1176844 by linclark: Changed Move sparql_endpoint_initialize() to main sparql module.
#1119490 by Remon: SPARQL endpoints registry redirects outside the admin area upon save
#1148258 by Remon: SPARQL Registry should validate that Endpoint is full URL
Issue #1177938 by cwells73: Clean up sparql.info.
Issue #1195840 by Remon: sparql_endpoint_initialize should take ['host'] into account
Issue #1178042 by scor: Fixed Align SPARQL endpoint module with the new rdfx API for build the RDF model.
Issue #1175628 by cwells73 | linclark: Remove crufty sparql.inc file.
Issue #1175618 by Remon: Specify a package for the SPARQL Endpoints registry module.
#1136944 by barbi | linclark: Changed ARC2 is a dependency, but not handled as such.
Issue #1162700 by barbi: Use a consistent title for SPARQL Endpoints registry module.
Issue #1162680 by scor: Fixed Access bypass in menu items of SPARQL registry.
Issue #1130594 by scor: Move sparql_ep module into SPARQL and name it sparql_endpoint
by linclark: Updated README and remove uninformative INSTALL file.
Issue #1136924 by linclark: Remove unused SPARQL settings form.