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
增加若干功能(issue43-47)，增加鉴权中间件
add wishes-choosing page
Extract position-item template
rename wish->preference
change position-editor page acording to SRS
add import-user module
add modify password module
add new role admin and admin-setting module
add backbone framework and try to use