instructorCourseEditPage goes out of memory #2496

@damithc @franklingu  As title, I have implemented the AJAX request for this page. However, I think it is neccessary for Junchao to do some manual testing to make sure all functionalities for the access control are still working since I am not very familiar with this feature. 
After making sure all funcitonalities are working, I will proceed to completing the testing part