Gradle基礎:http://stormzhang.com/devtools/2014/12/18/android-studio-tutorial4/
gradle官方指導:https://docs.gradle.org/current/userguide/userguide.html
Android項目中如何用好構建神器Gradle:http://www.csdn.net/article/2015-08-10/2825420/2
gradle加速構建:http://blog.isming.me/2015/03/18/android-build-speed-up/