Merge branch 'master' of https://github.com/TEAMMATES/repo
added tests for EditPageAction and removed a redundant condition
Merge branch 'master' of https://github.com/TEAMMATES/repo into Issue1849
added test cases to handle access to edit page

check whether the edit link is clickable for the different users
Merge branch 'master' of https://github.com/TEAMMATES/repo into Issue1849
Merge branch 'master' into Issue1849
[1849] Clean up InstructorFeedbackEditPageAction

fixes #1849