[Merge] lp:~phablet-team/gallery-app/share-from-selection into lp:gallery-app

[Bill Filler]

Review: Needs Fixing

Another issue:
I see the header stay visible if it was previously turned on, meaning: 1) from events view open a photo and click on it to reveal the header 2) press back button 3) select a photo and share. Then header incorrectly visible on pick screen
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https://code.launchpad.net/~phablet-team/gallery-app/share-from-selection/+merge/234215
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