Add method to get Device ID to Can Jaguar (fixes artf3613)

Change-Id: I7b0cb555a56ee97cf90ea32a3080b7c14bb5ca56

wpilibj/wpilibJavaDevices/src/main/java/edu/wpi/first/wpilibj/CANJaguar.java

@@ -2103,6 +2103,10 @@ public class CANJaguar implements MotorSafety, PIDOutput, SpeedController, LiveW
 	public String getDescription() {
 		return "CANJaguar ID "+m_deviceNumber;
 	}
+	
+	public int getDeviceID() {
+		return (int)m_deviceNumber;
+	}
 
 	/**
 	* Common interface for stopping a motor.