No more bit-banging the DMX signal

Still needs much, much more work.
Switching to using dedicated hardware to send the DMX signal. It will use an Arduino Pro Mini to do the transmitting and the calculator's link port for communication.
See http://www.cemetech.net/forum/viewtopic.php?p=202340#202340 for a hardware list. More info coming.
Update readme to match master branch
Merge pull request #1 from ajcord/arduino-pro

Arduino Pro code