Added method to create a seq number from a long

dddsample/tracking/core/src/main/java/se/citerus/dddsample/tracking/core/domain/model/handling/EventSequenceNumber.java

     return new EventSequenceNumber(SEQUENCE.getAndIncrement());
   }
 
+  public static EventSequenceNumber valueOf(final long value) {
+    return new EventSequenceNumber(value);
+  }
+  
   public long longValue() {
     return value;
   }