finish permessage-deflate implementation

[bakercp]

Currently, basic permessage-deflate is supported for websocket servers.

• [ ] Support non-default settings
• [ ] Add settings for zlib config
• [ ] Support Fragmented packets
• [ ] Test with autobahn]
• [ ] Clean up unused Poco/inflate/deflate includes.

@brannondorsey

[bakercp]

autobahn references

• https://github.com/crossbario/autobahn-testsuite
• https://github.com/warmcat/libwebsockets/issues/198
• https://github.com/JoakimSoderberg/libws
• https://github.com/zaphoyd/websocketpp/blob/master/examples/testee_client/testee_client.cpp
• https://github.com/zaphoyd/websocketpp/tree/master/examples
• https://github.com/JoakimSoderberg/libws/blob/master/test/autobahn/autobahntest.c