[Merge] lp:~fboucault/camera-app/ui_rewrite into lp:camera-app

[Olivier Tilloy]

Review: Approve

All autopilot tests now pass on my N7, and functional testing is satisfactory.

I’m still seeing a couple of functional issues, but we’ve discussed them and agreed that they can be addressed separately, after this MR lands:

 - zoom not working on N7 with the back camera (front one works)
 - video thumbnail not generated at the right moment, and isn’t refreshed in the grid view of the photo roll until orientation changes

Please make sure you file bugs for those and address them promptly after this lands.
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https://code.launchpad.net/~fboucault/camera-app/ui_rewrite/+merge/224451
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