rectify some other problems caused by the difference of user_type and user_group, we now use user_type,update your database
forum调试完毕，写了一个很简单的界面
改了一个按钮
add navbar containing user's information and functions to the header
add error report section, need to debug
Merge branch 'dev' of github.com:JYWa/teamstyle16 into dev
Merge branch 'thy' into dev
decorate team page
Merge branch 'dev' into thy