Added hashCode method for inner Token class as recommended by PMD

git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/lang/trunk@419176 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/commons/lang/time/DurationFormatUtils.java

@@ -618,6 +618,15 @@ public boolean equals(Object obj2) {
             }
         }
 
+        /**
+         * Returns a hashcode for the token equal to the 
+         * hashcode for the token's value. Thus 'TT' and 'TTTT' 
+         * will have the same hashcode. 
+         */
+        public int hashCode() {
+            return this.value.hashCode();
+        }
+
         /**
          * Represents this token as a String.
          *