Addresses #35 - Fixes deploy_docs confirguation by adding correct dependencies

.gitlab-ci.yml

@@ -37,6 +37,8 @@ build_and_deploy_docs:
         - tests
     before_script:
         - pip install awscli
+	- apt update
+	- apt install -y graphviz libgl1-mesa-glx xvfb xdg-utils
     script:
         - pip install -r requirements_dev.txt
         - python setup.py install