[Merge] lp:~phablet-team/music-app/final-declarative-playlist-api into lp:~music-app-dev/music-app/media-hub-bg-playlists-rework

[Andrew Hayzen]

Review: Approve

LGTM, we can fix any further issues in the other branch :-)
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https://code.launchpad.net/~phablet-team/music-app/final-declarative-playlist-api/+merge/277357
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