clean-up
Merge remote-tracking branch 'origin/Development' into Astron

Conflicts:
	BinaryStudio.PhotoGallery.Web/Utils/IModelConverter.cs
	BinaryStudio.PhotoGallery.Web/Utils/ModelConverter.cs
CleanupTask doesn't delete "temporary" directory, AlbumSearchService improving, fixed error in GetAvialableAlbums, user Golovin now can see album of user Towstonog.
Refactoring: removed ModelConverter
Refactoring: move PhotoController actions into Api
Merge remote-tracking branch 'origin/Development' into Astron

Conflicts:
	BinaryStudio.PhotoGallery.Web/Utils/IModelConverter.cs
Merge remote-tracking branch 'origin/Development' into maaak
Added a base structure of adding system groups such as "BlockedUsers"
Added check for system groups. Now you can't create or delete such groups.