Teacher can edit students
remove stray settings after True
remove HttpResponseForbidden restriction on editing students (we just
disable the button for them)
oh look, i forgot to prepend test_* to my test names, hence they weren't
being run
change test_teacher_cant_edit_students to test_teacher_can_edit_students
make sure we update the restricted teacher dynamic settings, as they may
change on the fly when running multiple test cases in a row, and we only
read the dynamic settings base class once
Merge pull request #2680 from aronasorman/allow_teacher_edits

Allow teacher edits