added RetrieveUpdateAPIView
added missing line
Add 'patch' http method support to the Django View object
Adding PATCH support to Django REST Framework
Subclass Django's RequestFactory to provide PATCH support
Adjust PATCH test cases to use the new DRFRequestFactory
Removing Partial Update classes

PATCH methods merged into RetrieveUpdateDestroy class
Renaming DRFRequestFactory to RequestFactory

Updated tests to reflect the new name.
Merge branch 'master' of git://github.com/tomchristie/django-rest-framework into patch-support
Merge branch 'master' of git://github.com/tomchristie/django-rest-framework into patch-support
Merge branch 'patch-support' of https://github.com/ahankinson/django-rest-framework into patch
Keep API backwards compatible.
Added `RetrieveUpdateAPIView`
Merge branch 'patch'
Added @ahankinson, for PATCH support. Thanks!
Add `.patch()` method for `RetrieveUpdateAPIView`