[Merge] lp:~artmello/camera-app/camera-app-multi_selection into lp:camera-app

[Bill Filler]

Review: Needs Fixing

works well, but found one small issue. The share action should be disabled if multiple pictures selected as sharing is currently only supported for a single picture in the clients that support it (messaging-app and facebook)
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https://code.launchpad.net/~artmello/camera-app/camera-app-multi_selection/+merge/240320
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