Custom user
User fields should be configurable per box, for example to add "refugee number" when the box is in a refugees camp. We don't want to have an email account mandatory. Password should not be mandatory to create the account, only to log in (many people will never log in). Only two groups for now: staff, admin.
https://docs.djangoproject.com/en/1.7/topics/auth/customizing/#extending-the-existing-user-model