Tag views with ImagePresenters in constructor

This should be safe since we're using tag with
an id and it eliminates one extra step required
to use ImagePresenters.
setPlaceholder... -> progress in Glide.load
Updates comments and code cleanup in Glide
Remove generics from ImagePresenterCoordinator

No reason why it can't coordinate presenters for
different types of models
ImagePresenter comment/code cleanup
Update comments for ImageManagerLoaders
Remove misleading constructors from RecycleableBIS
Add comment for LoadedCallback
Should have been in make coordinators not generic
Call cb in background in VolleyStreamLoader

This means our code in the cb will run on a 
background thread. Though all we do is post to a
thread pool, this change means we don't need to
acquire that lock on the main thread.