Relay module ======
Controls relay module with GPIO pins, the Adafruit GPIO libraries are needed.
Example usage ------
BeagleBone - turn on relay at GPIO P8_10
python driver.py -p P8_10 -m on
BeagleBone - turn on reverse-logic relay at GPIO P8_10
python driver.py -p P8_10 -m on -r on
Raspberry Pi - turn off relay at GPIO #4 on board
python driver.py -p 4 -m off
Raspberry Pi - turn on relay at GPIO #18 on expansion board
python driver.py -p BMC18 -m on -r on
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