moved image manager to an interface
removed pixel format property
hide concurrent dictionary from folder subclasses
show album count
changed ActualChildren to IEnumerable
Added image output format param
cleanup repeated querying within CollectionFolder
treat almost 720p as 720p
prevent DOS in directory watchers
fixes #518 - Add api param for watched indicator on images
made folder sync lock protected
delete temp files during cache deletion task
moved new image options to the model
added ControllableByUserId to sessions url
updated nuget