Add simple Spark notebook and environment

[mrocklin]

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[review-notebook-app]

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[jrbourbeau]

Thanks @mrocklin. I've not actual run this notebook, but I've assumed you have and things work well (happy to run myself if you'd like).

My only comment, which is a non-blocking nit, is if the dask.config.set({"dataframe.convert-string": True}) line is needed. Maybe an old version of Dask, where this isn't the default, is getting pulled in?

[jrbourbeau]

Actually, is that last cell needed at all? Is looks like it's just Dask, not Spark? Maybe this comes up in the talk-track?

[mrocklin]

Ah, thanks. Fixed.

[jrbourbeau]

Thanks -- will merge after CI is done