This commit adds the ability to enable compression for websockets.
The compression is disabled by default due to the fact that it is marked
as experimental in gorilla/websocket and there have been issues with
compression whenever Safari is enabled.
This commit partially addresses d-Rickyy-b#30.

I appreciate the comment as explanation, but using regular bools in the struct will lead to the default values being parsed. The default value for bools is "false". So there's no need to use a pointer in here.