Fix meta_class, sis lass instance variables and class methods

after some serious recursive thinking it now actually makes sense
The key was to change the actual type of the class that the meta_class manages
For objects it's (still) ok just to change the instance_type, but since the class object exists and has type, when adding instance variables, that actual type has to change

lib/parfait/meta_class.rb

@@ -43,6 +43,12 @@ module Parfait
       inspect
     end
 
+    # adding an instance changes the instance_type to include that variable
+    def add_instance_variable( name , type)
+      super(name,type)
+      @clazz.set_type(@instance_type)
+    end
+
     # Nil name means no superclass, and so nil returned
     def super_class
       return nil