ABTest Home initial commit
Merge pull request #34 from ainilife/master

ABTest Home initial commit
Merge branch 'abtest' of https://github.com/dianping/cat
老吴review代码之后的一些完善：添加list的Entity；去掉中文注释；ABTestEntity添加GroupStrategy属性，初始化时即lookup并设置；ABTestId问题