Added support for websocket when using gevent
Added support for websocket when using gevent

miguelgrinberg/Flask-SocketIO,miguelgrinberg/Flask-SocketIO,jwg4/Flask-SocketIO,Grant1219/Flask-SocketIO,njamaleddine/Flask-SocketIO,njamaleddine/Flask-SocketIO,Grant1219/Flask-SocketIO,jwg4/Flask-SocketIO