Clear out our PlaceManager listenerships when we shutdown to ensure that the

manager can be collected even if the object lingers about for a while and
because it sets a good example.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4823 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/crowd/server/PlaceManager.java

@@ -254,6 +254,10 @@ public class PlaceManager
      */
     public void shutdown ()
     {
+        // clear out our listenership
+        _plobj.removeListener(this);
+        _plobj.removeListener(_bodyUpdater);
+
         // destroy the object and everything will follow from that
         CrowdServer.omgr.destroyObject(_plobj.getOid());