Add .gitlab-ci.yml

.gitlab-ci.yml

+image: python:latest
+stages:
+  - test
+
+before_script:
+  - python -V
+
+check:
+  stage: test
+  script:
+  - pip install flake8
+  - flake8 karma.py
+
+test:
+  stage: test
+  script:
+  - pip install errbot pytest
+  - pytest