Update for compatibility with Serial via Bluetooth

I thought further changes would be required, but the only change needed
to get serial working over Bluetooth using HC-06 Serial-Bluetooth for
Arduino was the baud rate.  I had it on 19200 and have changed it to
9600 to match the hardware BT module.
Merge pull request #2 from levans88/Bluetooth-Serial

Update for compatibility with Serial via Bluetooth