Merge branch '1.1' of github.com:mindpin-shcmusic/pin-2012-edu into 1.1
Merge branch '1.1' of github.com:mindpin-shcmusic/pin-2012-edu into 1.1
Merge branch '1.1' of github.com:mindpin-shcmusic/pin-2012-edu into 1.1
Add validation before remove teaching plan
Add validation before remove teaching plan
Add validation before remove teaching plan
Merge branch '1.1' of git://github.com/arlyxiao/pin-2012-edu into 1.1