Added missing getVehicleHeading to interface

src/de/tudarmstadt/maki/simonstrator/api/component/vehicular/api/VehicleController.java

@@ -178,4 +178,10 @@ public interface VehicleController {
 	 *            {@link #getAllVehicles()})
 	 */
 	void stopVehicle(String pVehicle);
+
+	/**
+	 * @param pVehicleID
+	 * @return
+	 */
+	double getVehicleHeading(String pVehicleID);
 }