Add autocomplete to homepage and header searchboxes

Add:
+ Autocomplete entries for Neighborhoods/Locations/Google Geocoder
+ Autocomplete widget automatically added to any element with class "autocomplete-searchbox"
+ requirejs entry for the jquery ui autocomplete widget
+ css for the jquery ui autocomplete widget

TODO:
+ Add handlers for the on select action. Shims are in place for now. Blocked until we have the browse pages working.

What javascript style guide do you guys follow?