fixed copy method

Author: BFergerson

src/com/codebrig/beam/messages/BasicMessage.java

@@ -207,8 +207,8 @@ public T clear () {
     }
 
     @Override
-    public T copy () {
-        return super.copy ();
+    public T copy (T message) {
+        return super.copy (message);
     }
 
     @Override