Log Message:
Update goocanvas to 0.15.

GooCanvas 0.15	(Jun 29 2009)
==============

 o Fixed a bug that caused a hang when using GooCanvasWidget with
   accessibility support turned on.
 o Added "scale-to-fit" property to GooCanvasImage, to scale the image
   to the "width" and "height" settings, instead of just \ 
clipping.