Removed us_cities array, reformatted twitter query results to return a single array containing both non-nil location strings and arrays of coordinates.
Brough in David and Rachael's changes to the Google Maps API call (which now expects both coordinates and strings).

Merge branch 'user_location' of https://github.com/Murphydbuffalo/buzz_map into user_location
Set up string parsing to pass unformatted user location strings to the Google Maps API.
Shortened query time parameter.