Adds student registration with improvement to url handling.
Adds display functionality to add/drop page.
Adds registration API for student/section.
Automatically hides and shows 'add' button for student registration.
Adds credits to student's registered section list.
Adds drop section functionality to add/drop page.
Adds clean method to enforce max enrollment in classes
Fixes add/drop bugs in student registration.
Merge branch 'student-view' of https://github.com/kenthorvath/njit into student-view
Adds clean method to enforce max number of classes students can enroll in (6)
Adds clean method to enforce max time slots on sections