adjust

Dockerfile

-FROM ubuntu:artful
+#FROM ubuntu:artful
+FROM debian:testing-slim
 
 # dependencies via apt
 RUN apt-get update
 ADD ci/install_basics.sh /tmp/install_basics.sh
-RUN cd /tmp && chmod +x install_basics.sh && ./install_basics.sh
+RUN sh /tmp/install_basics.sh
 
 
 # python dependencies
 ADD ci/requirements.txt /tmp/requirements.txt
-RUN pip install --upgrade -r /tmp/requirements.txt
+RUN pip install --process-dependency-links -r /tmp/requirements.txt
 
 
 # copy sources and install nifty