Go back to using mx.resources.ResourceBundle, as it's the standard thing

and turned out to not be the class that was sucking in vast quantities of
flex code. Alas.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4596 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/as/com/threerings/util/MessageBundle.as

@@ -21,6 +21,8 @@
 
 package com.threerings.util {
 
+import mx.resources.ResourceBundle;
+
 /**
  * A message bundle provides an easy mechanism by which to obtain
  * translated message strings from a resource bundle. It uses the {@link