Created ReaderPhotoView as a replacement for using WPNetworkImageView for full-size photos
ReaderPhotoView now downloads a low-res version of the image before attempting to download the full-size version
Fixed bug that cause progress to fail to appear while loading image, lores/hires image URLs are now handled by ReaderPhotoView
ReaderPhotoView controls are now created dynamically rather than inflated
Fixes for null bitmap issues
Changed count to use semi-transparent background instead of a shadow