created global app view

- the global app view handles references to UI views
- the router now just updated it regarding current app data
moved 'hangup on signout' event listener to CallView
basic setup of a websocket service
live user list through websockets
removed obsolete comment
sync with master
removed the /users REST endpoint as we now rely on WebSockets
added more code comments
Merge pull request #28 from n1k0/live-user-list

Live user list