Added a method to teleport entities across worlds.

worldedit-core/src/main/java/com/sk89q/worldedit/extent/ChangeSetExtent.java

@@ -110,6 +110,12 @@ public class ChangeSetExtent extends AbstractDelegateExtent {
             return entity.getLocation();
         }
 
+        @Override
+        public boolean setLocation(Location location) {
+            // TODO Add a changeset for this.
+            return entity.setLocation(location);
+        }
+
         @Override
         public Extent getExtent() {
             return entity.getExtent();