edx/edx-platform — pull request #2985 by zubair-arbi (2014-03-19 12:12:13+00:00)
Title: remove course location from loc_mapper on delete

related to STUD-1416
1) remove course location form loc_mapper when it is deleted
2) don't remove users from instructor and staff groups it there are some other courses with same course_id but with different name case
3) fix course listing performance test