New matplotlibrc format?

Hi, I'm using matplotlib svn. It looks like matplotlibrc

    > from http://matplotlib.sourceforge.net/matplotlibrc is not
    > up-to-date :

Well, in general the one on the web should track the latest release
and not svn, but thanks for the tip. We've recently decided to go to
a "commented out" matplotlibrc so people will simply get the defaults
set by __init__.py. This will result in fewer warnings for naive
users who never change rc but end up with stale files. The only two
options that are on by default are backend and numerix (which are set
at build time based on your local environment).

I've updated the web file with these changes.

Cheers,
JDH