edx/edx-platform — pull request #3304 by zubair-arbi (2014-04-10 12:32:29+00:00)
Title: properly remove users from instructor/staff groups on a course delete

@waheedahmed @symbolist @adampalay
1) remove course_mapping in loc_mapper after removing users from course groups on delete, so that users are removed from correct groups.
2) ordered/cleaned some imports