Updates the mcity event 1 launch script

- Adds variable to launch script to set the ros_bridge to run in real-time, rather than fixed time steps.
- Updates the orientation of the initial spawn point of the ego vehicle.

launch/mcity_event1.launch

@@ -14,6 +14,7 @@
 	<include file="$(find carla_ros_bridge)/launch/carla_ros_bridge.launch">
 		<arg name="host" value="$(arg host)" />
 		<arg name="port" value="$(arg port)" />
+		<arg name="fixed_delta_seconds" value="false" />
 	</include>
 
 	<!-- shared by all the cars  -->
@@ -22,7 +23,7 @@
 	<include file="$(find carla_circle)/launch/car_simulation.launch">
 		<arg name="rolename" value="$(arg rolename)" />
 		<arg name="color" value="255, 0, 0" />
-		<arg name="spawn_point" default="46.8, 15.0, 2.0, 0.0, 0.0, 270.0" />
+		<arg name="spawn_point" default="46.8, 15.0, 2.0, 0.0, 0.0, 90.0" />
 		<arg name="max_speed" value="$(arg max_speed)" />
 		<arg name="opp_speed" value="$(arg opp_speed)" />
 		<arg name="plan_horizon" value="$(arg plan_horizon)" />