Update release notes
Allow OPTIONS to retrieve PUT field metadata on empty objects

This allows OPTIONS to return the PUT endpoint's object serializer metadata when the object hasn't been created yet.
Updated tutorial part 6: 2 examples were missing includes
Regression test for #1072
Handle case where obj=None in PKRelatedField.field_to_native()

Fixes #1072
Merge pull request #1077 from tom-leys/patch-2

Updated tutorial part 6: 2 examples were missing includes
Merge pull request #1078 from yprez/fix_1072

Fix empty serializer bug
Add windows virtualenv activate instruction

Closes #1075.
Changed DOAC documentation link
Merge pull request #1081 from kevin-brown/doac_docs_link

Updated DOAC integration link
Added test for OPTIONS before object creation from a PUT
Tiny typo fix
Merge pull request #1084 from thetylerhayes/master

Tiny typo fix
Merge pull request #1076 from edmondwong/master

Allow OPTIONS to retrieve PUT field metadata on empty objects
Added @edmundwong for work on #1076.  Thanks!
Fix typo
added guardian as optional requirement, stubbed out object-level permission class
some properly failing tests, set up for standard permissions
Support customizable view EXCEPTION_HANDLER

Add `api_settings.EXCEPTION_HANDLER` to support custom error responses.

Fixes #907.
Add EXCEPTION_HANDLER docs to exception docs