minor gtk issues with 0.64

1. I had to change

      toolbar = NavigationToolbar(canvas)
    > to

      toolbar = NavigationToolbar(canvas, win)

    > where win is the GTK window object. I guess the
    > matplotlib API is still unstable. :slight_smile:

Oops. This one slipped under my radar screen. Sorry I didn't
announce it as an API change. This also break
examples/embedding_in_gtk2.py, for the same reason (fixed in CVS).

Thanks for letting us know...