worker: open a chat window when receiving a talkilla.call-start event
worker: forward a started call when the chat window is ready
Fix indent
First draft of ChatApp and tests
ChatApp: implement the Call model
added basic text chat models
ChatApp: handle start and incoming events
added basic text chat models
new sidebar user entry click handler
merge
opening chat window when clicking on a user entry in the sidebar
ChatApp: refactor the app to have a _onCallStart handler
Fix issues surfaced by jshint
Merge pull request #84 from tOkeshu/chat-window-call

Chat window call
Cherry-picked Romain's webrtc model
Fix all but one jshint issues; the last of which appears to be a real bug
ChatApp: refactor the app to have a _onIncomingCall handler
ChatApp: rename _onCallStart to _onStartingCall
ChatApp: create a sdp offer when starting a call
WebRTCCall: refactoring