Updating the gitlab-ci.yml for the new runner

.gitlab-ci.yml

-image: python:3.4
-
-test:
+test python 3:
   script:
-    - python setup.py install
+    - virtualenv --python=python3 env
+    - source env/bin/activate
+    - python setup.py develop
     - python manage.py test
   stage: test
   tags:
-    - python
-
+    - test