Add "pretty" IPython representation for jobs

[apdavison]

It would be nice in Jupyter notebooks to have a "pretty" representation of the Job data structures.

The documentation for this is here: http://ipython.readthedocs.io/en/stable/api/generated/IPython.lib.pretty.html

(suggestion by Michael Schmuker)

[Huitzilo]

Thanks for creating the issue, Andrew!

Another way to enable a better interface in a notebook might be through Renderjson https://github.com/caldwell/renderjson

It essentially takes JSON and renders it nicely (at least that’s what it says in the description, I haven’t really tried it). This would require converting the job data structure to JSON and then using renderjson to render it in a jupyter notebook.