Copy risc compiler stuff to mom

Start to separate the layers. 
wip, just checkin in to see the following changes better

lib/vool/class_method_statement.rb

@@ -11,6 +11,7 @@ module Vool
       raise "not meta" unless clazz.class == Parfait::MetaClass
       raise( "no class in #{self}") unless clazz
       method = clazz.add_method_for(name , make_arg_type , make_frame , body )
+#VoolMethod
       compiler = method.compiler_for(clazz.instance_type)
       each {|node| raise "Blocks not implemented" if node.is_a?(BlockStatement)}
       compiler

lib/vool/class_statement.rb

@@ -29,7 +29,7 @@ module Vool
           raise "Only methods for now #{node.class}:#{node}"
         end
       end
-      Mom::MomCompiler.new(method_compilers)
+      Mom::MomCollection.new(method_compilers)
     end
 
     def each(&block)