Fix travis coverage

Author: kmmbvnr

.travis.yml

@@ -16,4 +16,4 @@ install:
   - pip install psycopg2
 
 script: 
-  - tox -e travis
+  - tox -r -e travis

tox.ini

@@ -46,12 +46,13 @@ deps = {[testenv]deps}
 [testenv:travis]
 basepython=python3.3
 commands = coverage run --branch --source=viewflow tests/manage.py test viewflow tests.integration tests.unit tests.examples
-           pip install django>=1.7
-           coverage run --branch --source=viewflow tests/manage.py test viewflow tests.integration tests.unit tests.examples
+           pip install django>=1.7 -U
+           coverage run --append --branch --source=viewflow tests/manage.py test viewflow tests.integration tests.unit tests.examples
            coveralls
 usedevelop = True
 deps = {[testenv]deps}
-       django>=1.6.8
+       django==1.6.8
+       https://bitbucket.org/andrewgodwin/south/get/e2c9102ee033.zip#egg=South
        coveralls