Add empty 'home' template/controller, activate tab on change

Also refactored navbar into base template
WIP on basic search form
WIP on cultural selectors and checkboxes
Good progress on WIP.  Interface improving
Cleanup style, progress on environmental data search"
Hide environmental controls until selecting a variable
Merge branch 'master' into add_basic_search
Add filters for categories/variables
Add angular service for VariableCategory
wip on adding categories to cultural trait picker
Update category selects to work
Order categories by name
Add control labels
Removed labels but may put them back
Updated django-bootstrap3 to 3.2.1
Remove "container" from base div
Change "Search" link title to Dev prototype
Wrap search in div.container
Move individual search forms into their own partials
Refactoring basic search to separate controllers/views

Moved each search aspect into its own controller and partial
Search is now working for cultural traits
Results persist after search because they are stored in the root
controller.
Need to store search properties in root controller