adjusted travis.yml for the new tox settings
adjusted travis.yml for the new tox settings

xrmx/django-stored-messages,b0bbywan/django-stored-messages,nthall/django-stored-messages,evonove/django-stored-messages,b0bbywan/django-stored-messages,nthall/django-stored-messages,evonove/django-stored-messages,xrmx/django-stored-messages