Klempner

-------------------
- :compare:`0.0.2...0.0.3`
- Add support for the :envvar:`CONSUL_HTTP_TOKEN` environment variable.
- Set ``User-Agent`` when sending requests to Consul.
- Rework documentation.

-------------------
- :compare:`0.0.1...0.0.2`
- Add :data:`~klempner.config.URL_SCHEME_MAP` so that URL schemes can be
easily configured.
- Separate the :ref:`environment-discovery-method` method out from the
:ref:`simple-discovery-method` method. Previously the simple method would
fall back to using environment variables if they were set.

------------------
- :compare:`0.0.0...0.0.1`
- Implement :ref:`simple-discovery-method`, :ref:`consul-discovery-method`,
:ref:`consul-agent-discovery-method`, :ref:`kubernetes-discovery-method`
discovery methods.