countour problem with 0.87

Thanks Jeff for quick input. It is working well for me now.

    > For the examples, I download from the link on the homepage
    > which still points to
    > http://matplotlib.sourceforge.net/matplotlib_examples_0.83.2.zip

The website was a bit out of date but has been recently updated. The
examples link now points to a recent set of examples consistent with
0.87.

JDH