Task #1490376 by rupl: drush command to enable module issues a warning when CSS aggregation is disabled.

Adding variable and admin config for drupal_add_js() scope. User can now configure where the script is loaded in HTML.

Issue #1346122: re-writing path logic because module's path function assumes lib exists. Rewrote download logic to remove some remaining RDFx code.

Issue #1335834: removing hard dependency on Libraries API. Module will prefer Libraries when it is enabled, but falls back to the local copy when not configured properly.