update teacher edit
update teacher edit (phase 1)
update teacher edit (phase 2)
Merge branch 'dev' of https://github.com/mehere/RTSS.git into dev-YangWei
major revamp on db and data layer
Merge dev_xue into dev
update teacher edit (server done, waiting for DB test)
Merge branch 'dev' of https://github.com/mehere/RTSS.git into dev-YangWei