add to_s for statements

lib/vool/method_statement.rb

@@ -35,6 +35,11 @@ module Vool
       Parfait::NamedList.type_for( type_hash )
     end
 
+    def to_s(depth = 0)
+      arg_str = @args.collect{|a| a.to_s}.join(', ')
+      at_depth(depth , "def #{name}(#{arg_str})" , @body.to_s(depth + 1) , "end")
+    end
+
     private
 
     def make_frame