Functionality to pass optional :min_radius value to 'near' searches. Only works with ActiveRecord and not Sqlite.

  Example:

    class City < ActiveRecord::Base
      geocoded_by :address, :lookup => lambda{|obj| obj.custom_lookup }

      def custom_lookup
        # return custom lookup for record
      end
    end

Allow to set custom lookup option for Geocoder.search, Geocoder::Query.new and ActiveRecord::Base.(reverse_)geocoded_by

  Examples:

    class City < ActiveRecord::Base
      geocoded_by :address, :lookup => :nominatim
    end

    Geocoder.search("address", :lookup => :nominatim)

Adds test for freegeoip host configuration

The startpoint variable wasn't used when calculating the endpoint.

http_proxy & https_proxy settings can now be specified with or without
the protocol prefix.

Previously it was returning an exception which is not the same behavior as the other lookups.

This commit adds the Data Science Toolkit as a lookup type.  The DSTK behaves identically to the Google Maps API with the exception that it can be run behind your own firewall.  More information about this tool can be found here: http://www.datasciencetoolkit.org/