[Merge] lp:~artmello/gallery-app/gallery-app-new_header into lp:gallery-app

[Arthur Mello]

After a new round of tests I think all the mentioned issues were addressed. Excepts for the sharing option from the "Select" view. This seems not to work on the current version of gallery so I think we could handle that in a different MR.
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https://code.launchpad.net/~artmello/gallery-app/gallery-app-new_header/+merge/231601
Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~artmello/gallery-app/gallery-app-new_header into lp:gallery-app.