Added basic code to poll serial port, taken from
http://playground.arduino.cc/Interfacing/Java. Added RXTXcomm.jar and
librxtxSerial.jnilib, recompiled for 64 bits from
http://blog.iharder.net/2009/08/18/rxtx-java-6-and-librxtxserial-jnilib-on-intel-mac-os-x/.