Animated GIF and improved description.
Potential fix for IncompatibleRatioException with RandomTransitionGenerator.
Version bump to 1.0.1.
Changelog changed in README file.
Fix for null drawable

View has been crashing when no drawable has been set.
Merge pull request #6 from jozefknazko/patch-1

Fix for null drawable
Merge branch 'master' into dev
Fixes bad transitions generated by RandomTransitionGenerator when the drawable is changed.
Starts a new transition if the image or the TransitionGenerator is changed.