Add dao and sql
delete bin?
update
update
Merge branch 'dev' of github.com:xhy940801/Discovery into dev
Merge branch 'chong' into dev
finish user..DAO except exceptional handling
conflict fixed
update program annotation
Merge branch 'dev' of github.com:xhy940801/Discovery into dev
setup chong's application
Merge branch 'dev' into chong
Add UserManager and some Util class
I also have finished function register, login, getResetPasswordKey, resetPassword in UserManagerDefaultImpl class
finish UserManager
Merge branch 'dev' into chong
update RelationOfFriend system