Added admin serializer for the event registrations

Gijs Hendriksenrequested to merge
feature/event-admin-serializer into master

Short description

Added a separate admin serializer for the event registrations, in order to prevent data leaks. Also added an extra field to the events API to indicate whether a user has admin rights for a certain event.

Steps to use this feature

  1. Go to /api/v1/events/[pk]/registrations as normal user.
  2. Notice the available information has been limited.
  3. Go to /api/v1/events/[pk]/registrations as organiser of that event (or superuser).
  4. Notice extra information is available.
  5. Go to /api/v1/events/[pk]/.
  6. Notice the is_admin field has been added.

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