a matplotlib sphinx extension has moved into ipython

[argriffing]

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This causes a warning when I build sampledoc.

 MatplotlibDeprecationWarning: 
The Sphinx extension ipython_console_highlighting has moved from
matplotlib to IPython, and its use in matplotlib is deprecated.
Change your import from 'matplotlib.sphinxext.ipython_directive' to
'IPython.sphinxext.ipython_directive.

The change should be made in conf.py in sampledoc.

[argriffing]

I have a change that removes this warning, which I'll push when github has dealt with whatever IT problems it's having https://status.github.com/