Images are no longer faded in when isImmediate=true and isInLayoutPass=true
Default/error images now use ColorDrawable, and no longer fading in downloaded avatars (only photos/videos are faded in)
Simplified the default drawable, which corrects the problem where the default drawable doesn't fill the full imageView
Merge pull request #633 from wordpress-mobile/issue/632-wpnetworkimageview-issues

Issue/632 wpnetworkimageview issues