Renamed ReaderFeaturedImageFinder to ReaderImageScanner, added routine to extract a list of images from post content
1st pass at passing post content to photo viewer and scanning for images, very incomplete
Photo viewer now pages between photos, still very incomplete
Added caption to photo fragment, still needs work
Moved title (count) from fragment to activity
Merge branch 'develop' of https://github.com/wordpress-mobile/WordPress-Android into feature/reader-photo-swiper
Photo viewer is no longer transparent, handles rotation, and toggles title (count) when photo tapped
Removed toggling of title on tap, added shadow to title (count) so it's readable regardless of background color
Title (count) fades in and out while swiping
Image download failure message is now shown within the image fragment rather than as a toast
Code cleanup
Changed shadow of title count to make it more readable on light backgrounds.
Photon image url is now created using the min rather than max of height/width
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
Removed photo listener, count now appears at the bottom and is always visible