0.2.0:

* The pkg-config file is now called goocanvas-1.0 instead of libgoocanvas.
* The files should now be included as, for instance,
  <libgoocanvas/canvas.h>
  instead of 
  <libgoocanvasmm/canvas.h>
* Several constructors were corrected to properly initialize the underlying 
  C objects.
* The parent parameter was removed from all item constructors, 
  to avoid confusion with the unusual memory management used in the C API.
  Use add_child() instead.
* Various methods were added or improved. 

0.1.0

Initial version.
