Implemented WS_ on top of http server.
Renamed WS_STREAM_SOCKET as HTTP_STREAM_SOCKET.
Isolated websocket classes from httpd classes (nino).
This would ease reuse of future nino improvements if any.
Merge pull request #3 from jocelyn/patch2014015

Made websocket implementation on top of existing httpd server implementation
Provided an event interface for ws events 'on_... (..)'
+ code cleaning
code cleaning