Fix bug where response attributes with 'yes' or 'no' were turned into booleans.

https://github.com/adam12/maxmind/issues/2
Save raw response body in Response object.

https://github.com/adam12/maxmind/issues/3
Save and expose the HTTP response code in the Response object

https://github.com/adam12/maxmind/issues/3
Expose the query parameters of the Request object.

https://github.com/adam12/maxmind/issues/3