- Make `Host.is_editable`, `Show.is_editable`, `Note.is_editable`, and
  `Note.get_audio_url` static methods,
- Make `Schedule.instantiate_upcoming`, `Schedule.generate_timeslots`,
  `Schedule.get_collisions`, `Schedule.generate_conflicts`,
  `Schedule.make_conflicts` and `Schedule.resolve_conflicts` static
  methods. Most of these methods do not belong here.
- Fix signatures of methods for subclasses of `viewsets.ModelViewSet`
- Fix doctrins for subclasses of `viewsets.ModelViewSet`
- Fix comparisons with None (replace '==' and '!=' with 'is' and 'is not')

Close #49

- Add missing Serializer,
- also clean-up unused imports.

Also clean-up unused imports.

Also clean-up unused imports.

Also clean-up unused imports.

Public Shows

See merge request !9

- Django==1.11.29
- django-cors-headers==3.2.1
- django-oidc-provider==0.7.0
- django-tinymce==2.8.0
- django-versatileimagefield==1.11
- djangorestframework==3.11.0
- drf-nested-routers==0.91
- Pillow==4.3.0
- python-dateutil==2.8.1
- PyYAML==3.13

Later, upgrade
- Django up to 2.2.11, the current LTS version
- django-versatileimagefield up to 2.0, the current stable version
- Pillow up to 7.0.0, the current stable version
- PyYAML up to 5.3.1, the current stable version

See #28

- Field "FundingCategory" is not mandatory anymore
- Added new field "is_active": Active shows will be determined either by existing timeslots in the future (if show is active). If show is not active it will always be considered as inactive, even if there are upcoming timeslots.