Gitlab CI added

.gitlab-ci.yml

+image: registry.kszk.bme.hu/baseimg/python-tools
+
+stages:
+  - Init
+  - Testing
+  - Release
+
+pip:
+  stage: Init
+  script:
+    - python --version
+    - pip install -e .
+
+flake8:
+  stage: Testing
+  script:
+    - flake8 src
+
+pytest:
+  stage: Testing
+  script:
+    - pip install .[tests]
+    - py.test tests
+
+release:
+  only:
+    - master
+    - tags
+  stage: Release
+  script:
+    - python setup.py sdist bdist_wheel
+    - python setup.py upload --repository https://nexus.kszk.bme.hu/repository/pypi/
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