Modify map controls

Move zoom control to bottom right.  Move share control to bottom right and add link to heroku page.  Move geocoder control to top right - set as kept open.  Modify map instantiation - no longer adding fma2 map as tileLayer - now in the call to L.mapbox.map with zoomControl set to false and attributionControl set to false.  Add add info control to bottom right with attribution there now.