美团Android自动化之旅—生成渠道包:http://tech.meituan.com/mt-apk-packaging.html
Android Studio系列教程六--Gradle多渠道打包:http://stormzhang.com/devtools/2015/01/15/android-studio-tutorial6/
上文评论中 有以下两条关于多渠道包信息
https://github.com/ihrthk/android-gradle-mulchannel-plugin
http://stackoverflow.com/questions/18328730/how-to-create-a-release-signed-apk-file-using-gradle