[DOC] include libpysal.example api changes & reinstall splot for testing

[slumnitz]

• change doc-strings in _viz_esda_mpl.py to:

guerry = examples.load_example('Guerry')
link_to_data = guerry.get_path('guerry.shp')

• replace assert_raise by raise for purest in test_viz_esa_mpl
• reinstall splot for testing in unittests.yml
• remove .set_smart_bounds

[jGaboardi]

@martinfleis comment from earlier:

That is a doctest examples failure. It cannot test Matplotlib figures afaik. We should either skip that altogether or individually within each docstring.

[jGaboardi]

This failure seems to be related to the installed vs. not installed issue.

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[jGaboardi]

Excellent this is passing!

[jGaboardi]

This comment is for documentation & to gather my thoughts. It is not a blocker.

• This works the same way it does in tobler, etc. and it still nags me that I can't figure out why it works in spaghetti, etc. but not here...
• maybe there are differences in setup.py...?
• see also package not checked out? actions/checkout#410 and this on SO

[jGaboardi]

@slumnitz Shall I go ahead and merge?