Update search facets
Get search facets to a semi-acceptable state
Tweaks to search facets with dropdowns templates and added CSS
Merge branch 'ckan-2.x' into search-facets
Improve dropdown-based facets

* Show all items, not just the first 10
* Sort items alphabetically
* Reorder facets
* Change labels to singular
* Notice on Issues facet
Merge branch 'search-facets' into ckan-2.x