Changed
* First version of gds_metrics_python wrapper.
* Added Counter and Histogram stats based on metrics delivered by [GDS metrics Ruby][].
http_server_request_duration_seconds_bucket, http_server_request_duration_seconds_count, http_server_request_duration_seconds_sum, http_server_exceptions_total
[GDS metrics Python]: https://github.com/alphagov/gds_metrics_python