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

[Gustavo Pichorim Boiko]

Review: Needs Fixing

I think we should not expose the pick mode via URI, it is not useful in that case (as the URI opening is a fire-and-forget operation from the caller side's point of view).
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https://code.launchpad.net/~artmello/gallery-app/gallery-app-start_on_event/+merge/218977
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