Enabled sudo support for Jupyter Service

[rjurney]

I need to sudo pip install libraries, so I have enabled the GRANT_SUDO option. As outlined in this section: https://jupyter-docker-stacks.readthedocs.io/en/latest/using/common.html#docker-options under -e GRANT_SUDO=yes:

-e GRANT_SUDO=yes - Instructs the startup script to grant the NB_USER user passwordless sudo capability. You do not need this option to allow the user to conda or pip install additional packages. This option is useful, however, when you wish to give $NB_USER the ability to install OS packages with apt or modify other root-owned files in the container. For this option to take effect, you must run the container with --user root. (The start-notebook.sh script will su $NB_USER after adding $NB_USER to sudoers.) You should only enable sudo if you trust the user or if the container is running on an isolated host.

Closes #54