Added ci for releasing new versions to pypi

.gitlab-ci.yml

@@ -0,0 +1,37 @@
+image: python:3
+
+stages:
+  - test
+  - release
+
+flake8:
+  stage: test
+  script:
+    - pip install tox
+    - tox -e flake8
+
+release-package:
+  stage: release
+  only:
+    - master
+  script:
+    - pip install twine
+    - rm -f dist/*
+    - python setup.py sdist
+    - twine upload -u ${PYPI_USER} -p ${PYPI_PASS} dist/*
+
+
+.write_permission: &write_permission |
+    git config --global user.email "gitlab-ci"; git config --global user.name "gitlab-ci"
+    url_host=`git remote get-url origin | sed -e "s/https:\/\/gitlab-ci-token:.*@//g"`
+    git remote set-url origin "https://gitlab-ci-token:${CI_TAG_UPLOAD_TOKEN}@${url_host}"
+
+tag:
+  stage: release
+  only:
+    - master
+  script:
+    - *write_permission
+    - export VERSION=$(echo $(python -c "import _version; print(_version.__version__)"))
+    - git tag -a $VERSION -m "Version created by gitlab-ci Build"
+    - git push origin $VERSION