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*(2018-04-10)*
- :pr:`37`: Implement PEERCRED lookup over UNIX-socket HTTP connection.
* Discover connected process' PID/UID/GID
* Respect server switches: ``peercreds_enabled`` and
``peercreds_resolve_enabled``
* ``get_peer_creds`` and ``resolve_peer_creds`` methods on connection
* ``peer_pid``, ``peer_uid``, ``peer_gid``, ``peer_user`` and ``peer_group``
properties on connection
* ``X_REMOTE_PID``, ``X_REMOTE_UID``, ``X_REMOTE_GID``, ``X_REMOTE_USER``
(``REMOTE_USER``) and ``X_REMOTE_GROUP`` WSGI environment variables when
enabled and supported
* Per-connection caching to reduce lookup cost