Try to avoid double dipping (Reader a single led flash twice)
Add support for getting LDR (light sensor) readings from an Arduino. When the Arduino 'sees' a led flash it prints a line to the serial (usb) port. When the Raspberry Pi has read a line from usb it uses that! Probably best to ditch the gpio code in the future. Although I leave it in place now because it might be a good guideline for when my BeagleBone Black arrives.
Merge branch 'master' of https://github.com/ericvrp/PowerToThePeople