Make Addon model agree with actual db schema.
Clean up device_types constants
deal with POST/PUT issues with DRF and OAuth
AnyOf, a tool for composing permissions for DRF
switch to SlugOrIdMixin for CategoryViewSet
simplify and improve authorization objects
slug-or-pk field
simplify abuse resource serialization/unserialization
support None in TranslationSerializerField
Merge pull request #1363 from washort/app-resource-misc

API-related cleanups extracted from AppResource