Kind category filter

* Adds removable search filters in search options area when category, kind, agency (org_name), or language search are performed:

![screen shot 2013-10-07 at 7 05 44 am](https://f.cloud.github.com/assets/704760/1281040/ac42cb5c-2f5c-11e3-9fba-0f0c06f45e4d.png)

* Adds category listing to details view and makes categories clickable links that perform category-based search:

![screen shot 2013-10-07 at 7 06 16 am](https://f.cloud.github.com/assets/704760/1281049/c3f88dd6-2f5c-11e3-9a1f-75261692302f.png)

* Makes languages clickable links for performing service language-based search:

![screen shot 2013-10-07 at 7 06 27 am](https://f.cloud.github.com/assets/704760/1281055/d8073a84-2f5c-11e3-94ed-af91447c2257.png)

* Updates AJAX JavaScript, however, this functionality is carried over from an earlier branch and the JS code is not currently in use (AJAX is disabled). 

* Removes/disables unused code and tests.