Bug 847241 - Make switching to an app feel faster

Last-minute follow-up: revert the change to the visibility transition, as it
made the display transition invisible.
Bug 847395 - Blacklist new communication imports subdirectories
Bug 845305 - [Perf] Add startup test for the template app

The template app sometimes launches faster than the the app opening transition,
so it exhibited a corner case where the window_manager would not call the
callback after killing an app.
Bug 816484: remember when GPS/Wifi have been suspended by Airplane mode
Merge pull request #8273 from fabi1cazenave/persistentSettings-bug816484-dry

Bug 816484: remember when GPS/Wifi have been suspended by Airplane mode, r=timdream
Bug 827256 - Search by phone number