New command-line tools

I could be wrong (may need some fiddling) but the udev rule should look something like this:

# Standard Espruino udev rule
ATTRS{idProduct}=="5740", ATTRS{idVendor}=="0483", ENV{ID_MM_DEVICE_IGNORE}="1", MODE="0666", GROUP="plugdev"

# Run stuff when it's plugged in
ACTION=="add",SUBSYSTEM=="tty",SUBSYSTEMS=="usb",ATTRS{idVendor}=="0483",ATTRS{idProduct}=="5740",RUN+="/home/your/script.sh /dev/%k"