[ENH]Use peerInfo.userData in incomingStream event

SJS-156
[ENH]Re-write chat-room example

SJS-156
[ENH]New Demo using gridster grid library

Demo allows is really similar to datachannel demo (private and public
transfers)
SJS-156
[WIP]Config.js global for all + remove initialisation in config.js + remove private-transfer

Private transfer demo was the same as file-transfer
SJS-156
[WIP]Remove Video call example (too similar to Simple app)

SJS-156
[WIP]Add Favicon link + move javascript include to end of body
[WIP]Rewrite Main demo page to link all the demos

SJS-156