implementato nodeposition con to string e reverse. aggiunto copyright

queue/ArrayQueue.java

@@ -8,6 +8,8 @@ import exceptions.EmptyQueueException;
  * Date: 10/03/14
  * Time: 15:49
  */
+//Copyright (c) 2003 Brown University, Providence, RI
+//Additional modifications and methods by xgiovio
 public class ArrayQueue<E> implements Queue<E> {
 
       public ArrayQueue(){