Minor fix for #2092.
Fix non-determanistic unique constraint mapping. Refs #2092.
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Merge pull request #2097 from raonyguimaraes/master

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Fix non-determanistic default bug. Closes #2099.
Merge branch 'master' of https://github.com/tomchristie/django-rest-framework
Removed unused import from code snippet in tutorial
Merge pull request #2100 from LuRsT/patch-1

Removed unused import from code snippet in tutorial
Merge branch 'master' into 3.0-beta