Uses node-hid, which requires libusb and libusb-dev: sudo apt-get install libusb-1.0.0 libusb-1.0-0-dev libusb-dev
Must be run with sudo!
Also, currently (June 5 2015) we are only taking spot readings every , not averaging. We should change or specify.
Example output: {"sampleTimeSecs":1401879009,"humidity":35,"rawParticleCount":1,"particleCount":132}