WIP: Adding more fixtures

Simcha van Collem
2020-03-11T21:10:23+01:00

Closes #1003

### Short description
The pull request aims to add more fixtures to the local environment for testing purposes. The following fixtures will be added (Please provide input if you think something is missing or shouldn't be added):
* [x] Courses
* [ ] Exams, Summaries (not really sure about this one)
* [x] Photos
* [x] Albums
* [ ] Documents
* [x] Payments
* [x] Registrations

### Steps to use this feature

1. Run `./manage.py createfixtures -a`
2. See the new fixtures