Fixed jupyter_notebook_config.json file permission issues for unraid container as reported in issue 29

Author: mmartial

Jupyter_build/Dockerfile-unraid

@@ -15,6 +15,7 @@ RUN sudo chown -R jupyter /home/jupyter /dmc
 # Adding a default password to the running instance 
 RUN jupyter notebook --generate-config
 COPY jupyter_notebook_config.json /home/jupyter/.jupyter/jupyter_notebook_config.json
+RUN sudo chown jupyter.users /home/jupyter/.jupyter/jupyter_notebook_config.json
 
 WORKDIR /dmc