Added Dallas as sample location.

dddsample/src/test/java/se/citerus/dddsample/domain/model/location/SampleLocations.java

   public static final Location GOTHENBURG = new Location(new UnLocode("SEGOT"), "Göteborg");
   public static final Location HANGZOU = new Location(new UnLocode("CNHGH"), "Hangzhou");
   public static final Location NEWYORK = new Location(new UnLocode("USNYC"), "New York");
+  public static final Location DALLAS = new Location(new UnLocode("USDAL"), "Dallas");
 
   public static final Map<UnLocode, Location> ALL = new HashMap();