[Merge] lp:~artmello/gallery-app/gallery-app-fix_1581184 into lp:gallery-app

[Arthur Mello]

Arthur Mello has proposed merging lp:~artmello/gallery-app/gallery-app-fix_1581184 into lp:gallery-app.

Commit message:
Fix PickerScreen delay when previewing media files
Fix collections models to work properly with media type filtering when called from content-hub

Requested reviews:
  Ubuntu Phablet Team (phablet-team)
Related bugs:
  Bug #1581184 in gallery-app (Ubuntu): "Photo preview in picker mode is very slow"
  https://bugs.launchpad.net/ubuntu/+source/gallery-app/+bug/1581184

For more details, see:
https://code.launchpad.net/~artmello/gallery-app/gallery-app-fix_1581184/+merge/295003

Fix PickerScreen delay when previewing media files
Fix collections models to work properly with media type filtering when called from content-hub
-- 
Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~artmello/gallery-app/gallery-app-fix_1581184 into lp:gallery-app.
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