Change call signalling messages to be their own types of room events rather than room messages with different msgtypes: room messages should be things that the client can display as a unit message to the user.

Conflicts:
	webclient/room/room-controller.js

Added a timeout(40s) to $http stream requests (/events) in order to be notified by an error when there is a network issue. Thus, we can retry with a new request.

Recents update: do not care of events coming from the past (they are fired when doing pagination of room messages in the past)

Start fleshing out architecture section. Moar .rst formatting! Reword some copypastaed sections to be terser.

Added waitForInitialSyncCompletion so that clients can know when they can access to the data retrieved by the initialSync Request

Support multiple login flows when deciding how to login. Updated cmdclient and spec. Webclient doesn't need updating for this.

Start the events stream once the app starts (if credentials are in cache) or once the user gets logged in