Replaced `electron-webrtc` with `wrtc`.

[surprisetalk]

wrtc@0.1.6 is now published to NPM and working on Node.js! Hooray!

This should solve issue #76 .

If you're curious on how the problem was solved, feel free to check out this issue in node-webrtc.

[kdiogenes]

This works awesome, merge please!

[lacker]

Any idea when this will get into a new version of the npm module? This seems like a much cleaner way to do things than the electron subprocess.

[feross]

@surprisetalk Thanks for making this change. Seems to work a lot better with wrtc! :)