Added gitlab CI and removed pycodestyle version constraint

.gitlab-ci.yml

@@ -0,0 +1,39 @@
+image: python
+
+stages:
+- lint
+- test
+
+before_script:
+- curl -O https://bootstrap.pypa.io/get-pip.py
+- python get-pip.py
+- pip install -r requirements.txt
+
+after_script:
+- pip install codecov
+- codecov --token=7d117e6b-aab6-4283-ab19-166dafc38cf5
+
+python35:
+  image: python:3.5
+  stage: lint
+  script: TOXENV=lint tox -e py35
+
+python34:
+  image: python:3.4
+  stage: test
+  script: TOXENV=unit tox -e py34
+
+python35:
+  image: python:3.5
+  stage: test
+  script: TOXENV=unit tox -e py35
+
+python36:
+  image: python:3.6
+  stage: test
+  script: TOXENV=unit tox -e py36
+
+python37:
+  image: python:3.7-rc
+  stage: test
+  script: TOXENV=unit tox -e py37

requirements.txt

@@ -3,7 +3,7 @@ pytest
 pytest-cov
 pytest-xdist
 flake8
-pycodestyle<2.4.0 # flake8
+pycodestyle
 pydocstyle
 sphinx
 sphinx-autobuild