Android Material Design | User Delight | ViewPage slide

https://github.com/florent37/MaterialViewPager

http://stackoverflow.com/questions/18298590/first-time-user-guide-through-android-library

https://github.com/ongakuer/CircleIndicator

https://github.com/TaurusXi/GuideBackgroundColorAnimation

http://developer.android.com/training/animation/screen-slide.html

http://stackoverflow.com/questions/26954217/how-to-implement-first-launch-tutorial-like-android-lollipop-apps-like-sheets

https://android-arsenal.com/tag/111