Hoist mozGetUserMedia stubbing into a beforeEach to fix a bug
Change CallView tests to run in strict mode
Hoist webrtc creation from individual tests to beforeEach/afterEach
Implement displayRemoteVideo
Merge pull request #90 from dmose/chat-call-view

Implement displayRemoteVideo
Add worker handlers for talkilla.call-offer and talkilla.call-answer
Add front-end handling for offers from the webrtc model to the worker
Add front-end handling for answers from the webrtc model to the worker
Fix jshint errors
Merge pull request #91 from Standard8/chat-webrtc-worker

Hook up sending of offers and answers from the webrtc model to the worker and through to the server.  Large parts written by @Standard8, r=@dmose; the rest was paired by both of us.