seperate building and testing stages

.gitlab-ci.yml

-test-3.5:
+stages:
+  - build
+  - test
+
+build-3.5:
+  stage: build
   tags:
     - Linux
   variables:
     GIT_SUBMODULE_STRATEGY: recursive
   script:
-  - virtualenv --clear -p python3.5 .
-  - source bin/activate
+  - virtualenv --clear -p python3.5 ./venv3
+  - source venv3/bin/activate
   - python setup.py bdist_wheel --dist-dir dist3
+
+build-2.7:
+  stage: build
+  tags:
+    - Linux
+  variables:
+    GIT_SUBMODULE_STRATEGY: recursive
+  script:
+  - virtualenv --clear -p python2.7 ./venv2
+  - source venv2/bin/activate
+  - python setup.py bdist_wheel --dist-dir dist2
+
+test-3.5:
+  stage: test
+  tags:
+    - Linux
+  script:
+  - source venv3/bin/activate
   - pip install dist3/*.whl
   - cd tests
   - python -m unittest discover
 
 test-2.7:
+  stage: test
   tags:
     - Linux
   variables:
     GIT_SUBMODULE_STRATEGY: recursive
   script:
-  - virtualenv --clear -p python2.7 .
-  - source bin/activate
-  - python setup.py bdist_wheel --dist-dir dist2
+  - source venv2/bin/activate
   - pip install dist2/*.whl
   - cd tests
   - python -m unittest discover