Remove join_room from setup

[piranna]

Join_room is a webrtc.io artifact that is not on the standard, and also it would not be useful if you don't need a open, unlimited room (for example one with a members limit) or with PeerConnection. I propose to remove it from the connect logic and put it on an independent function that can be called after that by the programmer.

[YurySolovyov]

agree, we ca track clients in a better way, and also, i think there is no need to connect everyone in a room with peerConnection, it has to be done explicitly in a code

[dennismartensson]

I think this is valid point. How do ou propuse that we do this?

[YurySolovyov]

you can store sockets in an object using ids as keys.
for room functionality, there is several ways:

• rooms field in a socket
• rooms object that contains ids of sockets in a particular room
• or even both

IMO peer connections should be established by demand.