Added UNKNOWN status code

dddsample/src/main/java/se/citerus/dddsample/domain/StatusCode.java

  * Represents the different status codes for a cargo.
  */
 public enum StatusCode {
-  NOT_RECEIVED, IN_PORT, ONBOARD_CARRIER, CLAIMED
+  NOT_RECEIVED, IN_PORT, ONBOARD_CARRIER, CLAIMED, UNKNOWN
 }

dddsample/src/main/resources/messages_en.properties

 cargo.status.NOT_RECEIVED=Not received
 cargo.status.IN_PORT=In port
 cargo.status.ONBOARD_CARRIER=Onboard carrier
-cargo.status.CLAIMED=Claimed
+cargo.status.CLAIMED=Claimed
+cargo.status.UNKNOWN=Unknown