included #3c58fea5628a98a0677e3a73ebb0013c2768e403 from Salvo

Author: exo-core

src/main/java/com/github/rosjava_actionlib/ActionServer.java

@@ -151,6 +151,10 @@ public void run() {
      * Stop publishing the action server topics.
      */
     private void unpublishServer() {
+        // Stop the task run by the Timer.
+	    statusTick.cancel();
+	    statusTick.purge();
+
         if (statusPublisher != null) {
             statusPublisher.shutdown(5, TimeUnit.SECONDS);
             statusPublisher = null;