fix #397, make TargetAction use errorResId and errorDrawable
formatting fixes and documentation
Stop allocating array lists for each hunter.
Merge pull request #398 from square/dimitris/stop

Stop allocating array lists for each hunter.
added documentation links
Merge pull request #399 from codecrafters/targetAction

fix #397, make TargetAction use errorResId and errorDrawable
Make PicassoDrawable extend BitmapDrawable instead.
Merge pull request #400 from square/dimitris/extend

Make PicassoDrawable extend BitmapDrawable instead.
Merge branch 'master' into disk-cache

Conflicts:
	picasso/src/test/java/com/squareup/picasso/BitmapHunterTest.java