Guide for understanding ART and Dalvik

- https://developer.android.com/about/versions/android-5.0-changes.html#ART
- https://source.android.com/devices/tech/dalvik/
- http://opensourceforgeeks.blogspot.com/2015/02/difference-between-dalvik-and-art.html
- https://www.quora.com/Why-is-ART-better-than-Dalvik
- http://blog.safedk.com/technology/jit-n-androids-art-will-faster/
