Add support for webrtc data channels

[Sing-Li]

The new webrtc stack supports all styles of audio, video, and screensharing calls.

Upcoming chat-ops integration will include real-time streaming logs, graphs and other visual elements.

The streaming data can be carried and 'switched' by via webrtc data channels.

http://www.html5rocks.com/en/tutorials/webrtc/datachannels/

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[marceloschmidt]

This will allow us exchanging secret keys via webrtc without the interference of server: #268

[geekgonecrazy]

oooh! This is true! I like it!

[maxlinux2000]

Hi Sing-Li,
Please have a look to #968 closed.

[TwizzyDizzy]

As discussed: please add a label "feature-needs-review".

/cc @seanpackham

Cheers
Thomas