Fixed analytics counts on instructor dashboard.
LMS-11228
Passed cls=EdxJSONEncoder on json.dumps to fix save, edit and import.
STUD-2096
Merge pull request #4922 from edx/waheed/lms11228-fix-instructor-dash-analytics-count

Fixed analytics counts on instructor dashboard.
Merge pull request #4850 from edx/waheed/stud2096-fix-export-with-old-ora

Fix export course with old ORA components.
Allow one group in a group configuration.