Remove old django-dev environ

Author: ashwoods

tox.ini

@@ -16,7 +16,6 @@ envlist =
     {py27,py33,py34,py35}-django-18
     {py27,py33,py34}-django-17
     py27-django-16
-    py35-django-dev
     {py27,py35}-flask-{10,11}
     py35-flask-12
     py27-celery-{3,4}