Added Note on tox & .pyc files. Fixes #1957
Revert "Added Note on tox & .pyc files. Fixes #1957"

This reverts commit d6ccdfc53d266e1f6b329069722c106775120181.
Merge branch 'master' of github.com:tomchristie/django-rest-framework
Merge branch 'master' of github.com:tomchristie/django-rest-framework
Merge branch 'master' of github.com:tomchristie/django-rest-framework
Initial link from Serializers to Validators
Add missing definite article
Merge pull request #2204 from carltongibson/default-docs-fix

Clarify read-only & `unique_together` Documentation