Package updates and jupyter hub version sync

Version 0.6.1

• Creation of Docker Baseimage: jupyter/datascience-notebook:eb149a8c333a to minimise build time
• Update of jupyterhub and jupyterlab to version 1.0.0
• Including rgdal, reticulate and rgeos into dependencies
• fix julia build. Replaced json package version by removing dependency
  Gadfly and explicitly installing latest version of package JSON
• Set PYTHONPATH and PYTHONUSERBASE to $HOME/work/workspace/.local allowing persistent user installs

Jupyter Lab Julia Upgrade

Version 0.6.0

• Using the data science notebook now as the base image for jupyterlab containers
• Julia Lab has been upgraded to enable users loading data from an Object Store