Merge pull request #24 from Standard8/master

Add a guest login option to the mobile page.
Move some of mobile.js's webrtc call creation routines into media.js
Make sidebar use the new call functions in media.js
Merge getAudio/Video functions into webrtcMedia
Fix the Calling text so that it goes away once a call is estabilished
Rework data channels into media handling and don't create data channels for mobile / audio only connections
Merge git://github.com/mozilla/socialapi-demo
When needing audio and video, request both at the same time
Merge pull request #25 from Standard8/master

Reorder and locate call initiation routines to improve re-use of code
Merge pull request #27 from Standard8/index

Add app feature checking onto the index page, and point to the mobile page
Merge pull request #28 from Standard8/media

If needing both Audio & Video, only make one gUM request