rename the AbstractUIHandler interface to UIHandler
display the bitmap even if there is no output file
when the same URL is loaded and about to be drawn, don't cancel the job when reloading the same job
better debug logging
synchronize on the ImageView
keep the bitmap in memory in case it needs to be shown again
Merge branch 'master' of github.com:levelup/PictureCache

Conflicts:
	sample/src/com/levelup/picturecache/samples/MainActivity.java
	sample/src/com/levelup/picturecache/samples/MyPictureCache.java