refactor.

src/Cap.Consistency/Attributes/QMessageAttribute.cs

-using System;
-
-namespace Cap.Consistency
-{
-    [AttributeUsage(AttributeTargets.Method, Inherited = true, AllowMultiple = true)]
-    sealed class QMessageAttribute : Attribute
-    {
-        public QMessageAttribute(string messageName) {
-            MessageName = messageName;
-        }
- 
-        public string MessageName { get; private set; }
-    }
-}