Implement class instance variables

as they are just the type of the meta_class, that was relatively simple.
I feel this is what oo is meant to be, instance variables and methods for the objects, and since classes are objects, for them too.
Class variables seem like a design mistake, weird scoping rules and no data hiding (left as an exercise to the reader)

lib/parfait.rb

@@ -30,7 +30,7 @@ module Parfait
   def self.object_space
     Object.object_space
   end
-  
+
   class Object
     # redefine the runtime version
     def self.new( *args )