grid line patch

I've uploaded a patch to sourceforge that lets you control

    > the grid line attributes from the grid() function. So,
    > for instance, if you wanted red grid lines on one plot,
    > you can go grid(color='r')

Thanks Jordan, nicely done. I've committed this to svn revision 2159.

For all of the matplotlib developers (or potential developers!) out
there, we've fallen a bit behind on applying the sf patches and
resolving the reported bugs. Everyone try to pick a few off as you
have time.