Add jupyter script calling sage -notebook jupyter

Author: nthiery

Dockerfile

@@ -8,5 +8,6 @@ ENV HOME /home/${NB_USER}
 # Make sure the contents of our repo are in ${HOME}
 COPY . ${HOME}
 USER root
+COPY jupyter /usr/bin/
 RUN chown -R ${NB_USER}:${NB_USER} ${HOME}
 USER ${NB_USER}

jupyter

@@ -0,0 +1,4 @@
+#!/bin/sh
+
+shift # gobbles up the notebook argument
+exec /usr/bin/sage -notebook jupyter "$@"