add gitlab continuous integration config

.gitlab-ci.yml

@@ -0,0 +1,21 @@
+image: python:2.7.12-slim
+
+before_script:
+  - pip install -r requirements.txt
+  - pip install -r test-requirements.txt
+  - coverage erase
+
+variables:
+  COVERAGE_FILE: .coverage
+
+pytest:
+  stage: test
+  script:
+    - ONE_XMLRPC="http://localhost:2633/RPC2" python setup.py test
+  tags:
+    - docker
+
+after_script:
+  - coverage combine
+  - coverage report
+  - coverage html