···11+rsync the files of an itunes playlist with another directory, most likely a usb
22+music device.
33+44+creates symlinks in a scratch directory pointing to the real destination
55+directory, then uses rsync to actually copy them out to the destination.
66+77+requires the `appscript` gem.
88+99+usage: `ruby itunes-rsync.rb "ipod (auto)" /Volumes/music/`