Learning how to build gradle enabled android project
01_basic: convert simple eclpise project to gradle enabled project
02_dependency: support library project
03_sign: support apk sign mechanism
04_proguard: use proguard in gradle
05_overlay: build multiple variant
06_as: how to configure gradle correctly with Android Studio (preview)
07_tricks:
- rename and move out built apk files
- support lots of variant and AndroidManifest.xml
08_repo: package library project for faster building