gradle plugin to compress android png by using pngquant refer to https://github.com/imagemin/pngquant-bin and https://github.com/pornel/pngquant

android gradle 打包插件，依次完成以下两个功能： 1、使用qq压缩插件对包的资源进行混淆 2、对压缩包打出多渠道包