Updated RFC6455 handshaker to check values case insensitively
Made sure RFC6455 handshaker matches encoding properly
Added mbstring as a requirement for Ratchet
Refs #28, #30
Updated how Ratchet handles WebSocket sub-protocols
Broke out WsServerInterface to not extend MessageInterface;
Components will instead use Interface segregation principle
WAMP is now able to work without the developer having to
manually enable the WAMP sub-protocol