[Blasq] Added PhotosProxyModel.
[Blasq] Proxy everything through PhotosProxyModel.
[Blasq] Set SmallThumb in PhotosProxyModel for collections.
[Blasq] Don't sort album fronts by sizes.
[Blasq] Show album fronts in QML.
[Blasq] Arrange photo buttons in a column in QML.
[Blasq] Show action buttons only for photos.
[Blasq] UploadPhotosDialog::SetSelectedCollection().
[Blasq] Choose selected collection on image upload by default.
[Blasq] Removed "Photos" mask.
[Blasq Rappor] Support front-inserting photos.
[Blasq Rappor] Fetch & display just uploaded photos.