Changed Readme
Several changes made

- added ParallelAnimatorListener
- added getAnimatorSet() to Combinable animations for them to be added
to AnimatorSet for ParallelAnimator
- added getters/setters for duration & interpolator for ParallelAnimator
- revert animations and set to invisible when exit animations end
- regenerated JavaDocs
Update README.md

- updated ExplodeAnimation example
- added an example of ParallelAnimator
Minor changes
Merge pull request #1 from umairvatao/umair

Changed Readme
Changed Readme