[Radiant] Alias Page Extension

[Daniel Sheppard]

> > Are you sure that's what subclasses_of does? I know that 
> > there's definitely a method on ActiveRecord::Base that 
> keeps track of
> > subclasses as their created - maybe it's called something 
> > else - descendants maybe? - I can't remember, but I'm pretty sure it
> > exists.
> 
> lounge groggy # ruby script/console
> Loading development environment.
> >> Page.descendants

Well, that's just an alias for subclasses_of. I found the code that I remembered seeing - it was for tracking of subclasses by
observers - where for some reason the list of subclasses is stored by each observer rather than by the observee. 

Dan.