Merge pull request #341 from konsti/master

Support for X_REAL_IP and X_FORWARDED_FOR

lib/geocoder/request.rb

@@ -5,7 +5,13 @@ module Geocoder
 
     def location
       unless defined?(@location)
-        @location = Geocoder.search(ip).first
+        if env.has_key?('HTTP_X_REAL_IP')
+          @location = Geocoder.search(env['HTTP_X_REAL_IP']).first
+        elsif env.has_key?('HTTP_X_FORWARDED_FOR')
+          @location = Geocoder.search(env['HTTP_X_FORWARDED_FOR']).first
+        else
+          @location = Geocoder.search(ip).first
+        end
       end
       @location
     end