added refs to filemapped gpio
Merge pull request #4 from Vido/master

Fixing RaspberyPi() to the new Pin()
adjusted pins of tests to match breadboard
added cleanup method to unexport pins
added cleanup method to unexport pins, using atexit
calling cleanup in test
removed repeated test
doing cleanup over self.pins instead of raw pin map
removed call to set_pin_mode from DigitalPin.__init__
removed call to set_pin_mode from DigitalPin.__init__
added cleanup message to ghost
made research/rpi/blink.sh executable
fixing rpi cleanup
Merge branch 'master' of https://github.com/garoa/pingo
fixing rpi cleanup, still
fixing rpi cleanup, still, removed __del__
fixing rpi cleanup, back to iterating over DIGITAL_PIN_MAP
fixing rpi cleanup, added debug code
Refactored add_pin. With unittest.
cleaning up to call it a night