Update README.md
Merge branch 'develop'
Fixed a bug in LTI
Several changes

- added features to statistics per course and statistics export
- added categories for judgements; each course can have different categories in which the answers are evaluated individually
- changed the way roles work; users can have a different role in different courses now
- switched to Alembic for database migration
change to alembic.ini
fix for alembic
fix for alembic
fix for alembic
fix for alembic
Update settings.py
Update settings.py
bugfix
Merge branch 'master' of github.com:ubc/acj-versus
adjusted the testcases