[Seaside] WAComponent

[Ramon Leon]

> > Lucas, I fired up Pier last night after having not touched it in a 
> > while, went to do a small project and none of my components worked 
> > anymore, couldn't configure their settings.  Turned out seaside's 
> > WAComponent now includes an accessor on the class side called 
> > description, which returns the class name, and overrides 
> what Magritte expects to be a description builder.
> 
> Load the latest version of Magritte, this bug is fixed there.

Ah, I hadn't realized I was now required to inherit from MAComponent rather
than just using any WAComponent subclass, when did this change?