[story/CICO-15] added Jupyter Notebooks to project; added some exception handling, made item type configurable, and a couple small additions

[jophals]

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Make better versions of the 'Download' and 'Upload' Jupyter notebooks. They should be configurable regarding type of document, etc. also, it should handle downloads that are not complete yet.

Anything else the reviewer needs to know?

[jdamerow]

I made one or two comments in line, but generally there should be no urls in here and no cell output.

[jdamerow]

url should not be in here

[jdamerow]

this should probalby be specified here, not in const