Draft: [#3052574] Facets AJAX

Combine all of the compatible contributions into a working branch to allow easy review and continued work on the issue.

Please "fix conflicts+rebase 2.0.x" instead of merging in 2.0.x to avoid breaking history to a point that automated rebase no longer works.

js/facets-views-ajax.js

@@ -89,7 +89,7 @@
               }
             }
 
-            href = '/' + Drupal.Views.getPath(href) + '?' + $.param(queryParams);
+            href = settings.path.baseUrl + Drupal.Views.getPath(href) + '?' + $.param(queryParams);
 
             updateFacetsView(href, current_dom_id, view_path);
           };