Add a package.json file

Signed-off-by: Kai Blin <kai.blin@biotech.uni-tuebingen.de>
README: Clarify the license

Signed-off-by: Kai Blin <kai.blin@biotech.uni-tuebingen.de>
hardware: Get rid of gpio-admin dependency by taking care of exporting gpio pins

Signed-off-by: Kai Blin <kai.blin@biotech.uni-tuebingen.de>