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.