Added the geocoder gem, in preparation for sorting out proximity of entries.

Added prox field to the entries table, so I could store the return from a proximity method.

Indexed the ALL OF THE THINGS
Chucked in a location method to return an entries location in the right format for geocoder
Adjusted the logic of one of clean_them_out method
Updated the priorities in the README

Indexed quite a few of the fields in entries table, to speed up lookup and location retrieval.

Added proximity to the entries table and made some methods to add this value to all entries. This is required to determine and store the number of entries nearby each entry.

Renamed fields lng and lat to longitude and latitude, because Geocoder wasn't allowing otherwise. Updated all the specs to reflect this change
Merge pull request #3 from thomasgwatson/geocoder

Geocoder