简单的内存缓存实现，实现group概念，一个group里面是个有序的集合，集合支持key-value
Sat Aug 06 04:25:03 CST 2016
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Sat May 07 14:51:04 CST 2016
Fri Nov 17 15:20:30 CST 2017
wechat-group/weixin-java-tools的备份
Fri Jul 07 06:40:56 CST 2017
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Tue Jan 02 10:53:50 CST 2018
