Tried to Add Geocoder

Tried to add geocoder so we can type start/end locations. Turns out we
need supporting library/plugin -I thought it was part of LRM. Nope,
turns out it's related (and developed by same person), but not included.
That will be included shortly.
Added Geocoder Library

Unzipped geocoder control library from here
https://github.com/perliedman/leaflet-control-geocoder into our repo.
Added Geocoder Includes to map.html