Patch from #13 for single field migrations (wasn't properly doing singleton tuples)
Patch from #13 for single field migrations (wasn't properly doing singleton tuples)

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extra : convert_revision : svn%3A69d324d9-c39d-4fdc-8679-7745eae9e2c8/trunk%4065

theatlantic/django-south,theatlantic/django-south