Support populating docker image with sample notebooks

[rossbernet]

I followed this command:

docker run -it --rm --name geopyspark \
   -p 8000:8000 \
   quay.io/geodocker/jupyter-geopyspark

And the notebooks do not appear in the home directory in jupyter.

It would be extremely helpful for a first time user of GPS to be able to do a docker run and get some sample notebooks to play with.

@jpolchlo mentioned it looks like its close to enabling this, but something must be missing in terms of populating the notebooks in /home/hadoop - or wherever they need to be