Signaling-server for simple-peer demo

Simple socket.io implementation, tunnels based on scoket id's so multiple sessions can be supported

Registered users are not persistant so on leaving, their traces will be removed.

Events

Event	type	Description
online-users	broadcast	All online users, triggered when new user is connected
new-connection	broadcast	When new user is connected
left-connection	broadcast	When user disconnects
call	tunnel	When user calls to x user
accepted-call	tunnel	When user accepts the x user call
rejected-call	tunnel	When user rejects the x user call
end-call	tunnel	When user ends the call