Add a getDeviceNumber method to CANJaguar

[artf3613]

Change-Id: Idc01c0d27740bbb575f00de6065a7ced52f787e1

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

@@ -265,6 +265,14 @@ public class CANJaguar implements MotorSafety, PIDOutput, SpeedController, LiveW
 		configMaxOutputVoltage(kApproxBusVoltage);
 	}
 
+	/**
+	* @return The CAN ID passed in the constructor
+	*/
+	int getDeviceNumber()
+	{
+		return m_deviceNumber;
+	}
+
 	/**
 	 * Get the recently set outputValue set point.
 	 *