Merge branch 'CI'

.gitlab-ci.yml

+image: ubuntu:18.04
+
+before_script:
+- apt-get update -qq && apt-get install -y -qq python3 python3-pip
+- pip3 install numpy pandas scipy matplotlib 
+
+stages:
+- unittests
+
+  #doctests:
+#  stage: unittests
+#  script: python3 -m doctest -v hello_world.py
+
+unittests:
+  stage: unittests
+  script: python3 -m unittest discover -p 'test*.py'