removed unused NamedList

args and locals got inlined into message, forgot to delete then
ripples out due to type creation
small type class api change, more ripples, but also more consistent

lib/vool/method_expression.rb

@@ -38,7 +38,7 @@ module Vool
       type_hash = {}
       @args.each {|arg| type_hash[arg] = :Object }
       type_hash[:implicit_block] = :Block if has_yield?
-      Parfait::NamedList.type_for( type_hash )
+      Parfait::Type.for_hash( type_hash )
     end
 
     def to_s(depth = 0)
@@ -60,7 +60,7 @@ module Vool
         next unless node.is_a?(LocalVariable) or node.is_a?(LocalAssignment)
         type_hash[node.name] = :Object
       end
-      Parfait::NamedList.type_for( type_hash )
+      Parfait::Type.for_hash( type_hash )
     end
 
   end