It turns out that @cgohlke was using this to smoke test the windows wheels. We should provide an easy way to run all of the examples against the currently installed version of matplotlib and at least cycle through the Agg, svg, pdf, and one GUI backend.

Exact work:

• write a script in tools to exercise all of the examples and tutorials (this may have to deal with examples that call show, probably by turing on plt.ion() and defensively calling plt.close('all'))
• make the backend list configurable
• bonus: regex matching on file names