finish the new implementation of instructorPrivilege
Merge branch 'AccessControl' into 72936832
refactor instructorPrivileges
adding test and removing extra(facade) methods
completed all the tests, covered all method that are necessary
Merge branch 'AccessControl' into 72936832
adjustment of api. not much change on tests yet
adjustment of apis in instructorPrivileges
change to HashSet
Merge branch '72936832' into AccessControl