Merge pull request #913 from braydonf/feature/messages-for-modules

Export messages so that they can be extended from another module.

lib/transport/messages.js

@@ -155,7 +155,9 @@ Message.prototype.serialize = function(network) {
   message.put(payload);
 
   return message.buffer();
-}
+};
+
+module.exports.Message = Message;
 
 /**
  * Version Message