Still broken, but more cleanup

* websocket.lisp (websocket-unsupported-version)
(websocket-illegal-key): Delete it.
(process-request): Simplify further.
(handle-request): Delete it.
(acceptor-dispatch-request): Replaces HANDLE-REQUEST
specialization, cleaner.
Still broken, but more functional (hehe wtf??)

* websocket.lisp (*websocket-dispatch-table*): Renamed from
(websocket-client, websocket-resource): New classes.
(message-received, binary-received): New generics.
(call-with-new-client-for-resource)
(with-new-client-for-resource): New macro and its helper.
(websocket-send-term): Deleted.
(websocket-send-message): Renamed to SEND-MESSAGE.
(send-message): New function.
(websocket-loop): Remove implementation of draft protocols.
(websocket-chat-resource, message-received): Incomplete example
implementation of a chat client.

* package.lisp: New exports
Remove annoying copyright notice in every file