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

[Florian Boucault]

Needs https://code.launchpad.net/~fboucault/qtubuntu-camera/set_exposure_before_init/+merge/281524
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https://code.launchpad.net/~fboucault/camera-app/hdr_always_works/+merge/281635
Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~fboucault/camera-app/hdr_always_works into lp:camera-app/staging.