Update/clean changelog
Replace deprecated uses of GeoKit (capital K) with Geokit
Remove MaxMind geoip

 * Causing dependency issues for other users
 * Work on way for it to autoload for maxmind only
1.7.1 Release
Move geocoders to geocoders directory to match module name
Remove Geokit based methods. Use class directly.

e.g. Geokit::Geocoders::Geocoder.yahoo_geocode was available.
     Now only Geokit::Geocoders::YahooGeocoder
Simplify return statements

 * reverse_geocode keep res unless nil (consistent with geocode)
Simplify proxy code
Replace and/or/not with &&/||/! and clean surrounding code

 * Removed unnecessary self, assignment within if
Remove unnecessary returns and simplify else case
Extract classes into own files

 * Standards have files in modular structure
   e.g. Geokit::Polygon should be in lib/geokit/polygon.rb
Correct coverage status url
Remove duplicate google group link
Add newly supported geocoders and move to top as this is important
Remove no longer relevant install script info
Remove geoip blob
Add rake to download GeoLiteCity.dat.gz from maxmind
Merge remote-tracking branch 'josacar/master'
Return success in maxmind geocoder when lat/log is float
Test for Numeric in maxming geocoder