Add upgrade function to use peer connection
Add upgrade function to use peer connection

tranphuoctien/socket.io-p2p,socketio/socket.io-p2p,hharnisc/socket.io-p2p,gerhardberger/socket.io-p2p,gerhardberger/socket.io-p2p,shaunstanislaus/socket.io-p2p,hharnisc/socket.io-p2p,shaunstanislaus/socket.io-p2p