Ported to android-21
Don't make parameters final
Merge pull request #6 from taky/master

Ported to android-21
Update project for final L release

The project now requires Android Studio 0.8.9 or above
Remove unnecessary line for final L release
Various fixes

Fix color filter animations
Update to Gradle 2.1
Update to Gradle tools 0.13.2
Add content description strings to images
Fix RTL issue
Update .gitignore
Update build tools to 21.1.1
Update Android Gradle plug-in to 0.14.1
Update README.md