working in progress: get and update
Merge branch '72675318' into 72853822
getting started with tests
Merge branch '72675318' into 72853822
adjustment after merging
working on test. encountering issue with toString
Merge branch '72675318' into 72853822

Conflicts:
	src/main/java/teammates/storage/entity/InstructorPermission.java
Merge branch 'master' into 72853822
create test methods fro create and getForEmail
adjust to use createInstructorPermissions
two more tests to go
finished test
[Fixes 72853822]create instructorPermission db
finish the new implementation of instructorPrivilege
adjustment according to comments
Merge branch '72853822' into AccessControl
Merge branch 'AccessControl' into 72936832