Avoid running tests against master on Python 2.6
Avoid running tests against master on Python 2.6

charettes/django-admin-enhancer,charettes/django-admin-enhancer,DjangoAdminHackers/django-admin-enhancer,charettes/django-admin-enhancer,DjangoAdminHackers/django-admin-enhancer,DjangoAdminHackers/django-admin-enhancer