Add ability to publish stream from client side

[mboussaid]

is it possible to publish a stream directly from the client side for example we can capture the tab stream and send it to the server using peer to peer (webrtc) ? is it possible to implement this or it's already exist ?

[tevaum]

This feature is requested by a lot of people. My guess is we need to implement this ourselves if we want to see it here. Check #102