create an actionbar for undo/redo & revert to original

[elementaryBot]

when you edit a photo, pantheon-photos could show an action bar which shows these three options. That way we could remove undo/redo from the toolbar and "revert to original" from the right click menu.

Launchpad Details: #LP1406559 swizzle - 2014-12-30 14:56:09 +0000

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