Merge pull request #27 from VNOC/Sum_Branch

Sum branch
Merge branch 'master' of https://github.com/VNOC/vnoc into Sum_Branch
Merge pull request #28 from VNOC/Sum_Branch

Sum branch
zeng jia le zai xian yong hu lie biao gongn neng.
Rewrite the user-login verification logic, add a unit test of one username login more than 1 times.
rewrite the comments of userManage.hpp in English.
rewrite VnocMessageHandlerTest.cpp
Merge pull request #31 from lmykyo/eskimo

Eskimo's pull request.
Merge branch 'master' of https://github.com/VNOC/vnoc into Sum_Branch
修正buff长度问题导致的解析不正确问题