Separate out WiringPi from the Sensor code

[dakriy]

The wiring pi library needs to be abstracted away so that if the wiring pi library needs to be changed to something else, it can be. Or just stop using it all together as I think we can get away from it. At any rate, we need an abstraction interface to separate the code that does the actual OS calls from the sensor code to increase portability, and proper segmentation.