Fiddle search form

- Move some controls around - turn them into labels to increase the clickable area.
- Better bootstrapping
- Additional filters button made smaller and disabled (since it does nothing)
Load bootstrap JS _after_ jqueryui
Change the Search nav bar to tabs

Tabs make more sense here.
Search results bootstrapping

- Change thumbnails checkbox to toggle button
- Sort by inside the panel
Merge pull request #378 from nla/hr-search-bootstrapping

Search layout