More helpful error message when default `.create` fails. Closes #2013.
Merge branch 'fixes/2013' of git://github.com/gregmuellegger/django-rest-framework into gregmuellegger-fixes/2013
Minor tweaks for helpful message on Model.objects.create() failure.
Merge branch 'gregmuellegger-fixes/2013'
Update README with 3.0 info.