Merge pull request #20 from hopesfish/dev

Dev
Merge pull request #21 from hopesfish/dev

1 检测用户是否唯一
Merge pull request #22 from hopesfish/dev

修改
提交密码重置功能
Merge pull request #23 from hopesfish/dev

密码相关/用户管理的草稿代码
1.密码修改及重置功能提交
Merge pull request #23 from pengqin/dev

Dev