Fixed Traci-Shutdown

src/de/tud/kom/p2psim/impl/topology/movement/vehicular/sumo/simulation/controller/traci/TraciSimulationController.java

@@ -119,15 +119,7 @@ public class TraciSimulationController implements VehicleController, SimulationS
 				e.printStackTrace();
 			}
 
-			Runnable shutdownHook = new Runnable() {
-
-				@Override
-				public void run() {
-					_connection.close();
-				}
-			};
-
-			Runtime.getRuntime().addShutdownHook(new Thread(shutdownHook));
+			Simulator.getInstance().addObserver(this);
 
 			_initalized = true;
 		}