1The Geokit gem provides:
2- Distance calculations between two points on the earth. Calculate the distance
3  in miles, kilometers, meters, or nautical miles, with all the trigonometry
4  abstracted away by Geokit.
5- Geocoding from multiple providers. It supports Google, Yahoo, Geocoder.us, and
6  Geocoder.ca geocoders, and others. It provides a uniform response structure
7  from all of them. It also provides a fail-over mechanism, in case your input
8  fails to geocode in one service.
9- Rectangular bounds calculations: is a point within a given rectangular bounds?
10- Heading and midpoint calculations
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