Updated README.md with current and prospective functionality.
I imagine a good solution would be to use the libusb-java wrappers
to dynamically discover USB devices based on known device/vendor IDs.
This was a quick, but not mindless, solution to an immediate problem.
There's a large amount of room for improvement.

I used the Perl script that exists for this scale as a basis for the
device-read logic, thought it is slightly modified.

-jh

	modified:   README.md