参考 http://mp.weixin.qq.com/s?__biz=MjM5NzA1MTcyMA==&mid=203787439&idx=4&sn=6271884638ebf1a6de63d90c68451180&scene=2&from=timeline&isappinstalled=0#rd http://jiajixin.cn/2015/01/06/memory_leak/
see http://zserge.com/blog/gradle-maven-publish.html http://felipecsl.com/blog/2013/12/06/publishing-an-android-library-to-maven-central/