Feature/map search

This implements the search box on the map page.  It will do autocomplete on the field for building IDs.  If the entered text is numeric only, it will search properties by building ID; otherwise, it will geocode an address.  Either way, it will pan to the location found and open a pop-up.  A message displays below the search box to say if it's currently performing a search, or if no results were found for the search.
Maybe a question for @jbranigan, but do you know if the map should also zoom in on search?