* Fix type mismatches in coursewaqre
* Fix type mismatch in credit migrations
* Fix type mismatch in status migrations
* Fix type mismatch in user_api migrations
* Review Fixes
Django 2.0 will make this field required for `ForeignKey` and `OneToOneFields`.
In previous versions the option defaulted to `models.CASCADE` when not
specified. This change should make the deprecation warnings in the current
Django version go away.
The migrations where also modified, but the changes should not cause a change in
the database schema since `models.CASCADE` was already the old default.