Get rid of skiptests
Split mongo correctly serializes and deserialized references
STUD-1592, STUD-1603, LMS-2642
Add tests for has_course
and negative tests for get_course.
Merge pull request #3901 from edx/dhm/opaque-dont-skip

Dhm/opaque dont skip
Merge pull request #3900 from edx/dhm/test_has_course

Add tests for has_course
i18n of Image Response [BLD-723]