Bug 1105176 - When leaving a room, the feedback screen will be shown to the user

See bug https://bugzilla.mozilla.org/show_bug.cgi?id=1105176 please. Action happens at https://github.com/jaoo/firefoxos-loop-client/tree/1105176.
Add a new param as `type: "call" || "room"` or something like that in order to differentiate