完成了用户管理模块

Change-Id: I649833ebd5cbc1a267b37bce5ab9751a7249610b
Merge branch 'master' of https://github.com/Hahn-/GdutExchange.git
小更新

Change-Id: I6833dabc8ac2cbbf609c2374d1e6d2594af6b19f