Expand permissions docs. Closes #2223.
Merge branch 'master' of https://github.com/tomchristie/django-rest-framework
Fixed a typo
Merge pull request #2298 from epicserve/fix_typo

Fixed a typo
Use six.BytesIO in tutorial. Closes #2296.
Merge branch 'master' of https://github.com/tomchristie/django-rest-framework