Added passenger methods to Vehicle/LivingEntity.

src/main/java/org/bukkit/Vehicle.java

@@ -28,10 +28,25 @@ public interface Vehicle extends Entity {
      */
     public Entity getPassenger();
     
+    /**
+     * Set the passenger of a vehicle.
+     * 
+     * @param passenger
+     * @return false if it could not be done for whatever reason
+     */
+    public boolean setPassenger(Entity passenger);
+    
     /**
      * Returns true if the vehicle has no passengers.
      * 
      * @return
      */
     public boolean isEmpty();
+    
+    /**
+     * Eject any passenger. True if there was a passenger.
+     * 
+     * @return
+     */
+    public boolean eject();
 }