Updated travis config to test against 1.5.x
Updated travis config to test against 1.5.x

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