a demo logic implementation to login
database connection & login logic
add client login logic demo code
change the code for testable server
add demo test code for login logic (half implemented)
fix: cancel the bubble event of save button
modified the userSchema, remove the unique attribute of role
modified the User schema, Created the Salt Schema. Add the create user
code
modified the login logic: add passwordHash
modified add user code
modified the login return value, add profile get
modified login return value, add profile get
add modified information code
save failed - return 400
add announcement code
add password modifie and logout code
Merge remote-tracking branch 'origin/lxyxynt-devel' into wangchao-devel
调整了一下“发布和获取公告测试用例”的缩进格式
增加若干功能(issue43-47)，增加鉴权中间件
add wishes-choosing page