[CI] add contiuous integration on the project

.gitlab-ci.yml

+
+test:python3.5-stretch-pyqt5:
+  type: test
+  image: docker-registry.esrf.fr/dau/tomwer:python3.5_stretch_pyqt5
+  script:
+    - arch
+    - export PYTHONPATH="${PYTHONPATH}:/usr/lib/python3/dist-packages/"
+    - export LD_LIBRARY_PATH=/lib/x86_64-linux-gnu/:${LD_LIBRARY_PATH}
+    - export http_proxy=http://proxy.esrf.fr:3128/
+    - export https_proxy=http://proxy.esrf.fr:3128/
+    - python --version
+    - python -m pip install pip --upgrade
+    - python -m pip install setuptools --upgrade
+    - python -m pip install numpy --upgrade
+    - python -m pip install matplotlib
+    - python -m pip install Orange3
+    - python -m pip install -r requirements.txt
+    - python -m pip install .
+    - /usr/bin/xvfb-run --server-args="-screen 0 1024x768x24" -a id06workflow test -v