changed pin map in Ghost to [(physical_location, pin_instance)...]
added pin location to Pin
added location argument and attribute to Pin and DigitalPin
changed logical_id to gpio_id
refactored _list_pins and _base_pin_path
started pcduino driver
added pycharm patters to .gitignore
Added Lucas Vido (@Vido) to CONTRIBUTORS.txt
documenting various schemes of doing IO through the filesystem
tests with RPi
Merge branch 'master' of https://github.com/garoa/pingo
working on rpi tests
blink.sh using sys filesystem
Merge remote-tracking branch 'upstream/master'

Conflicts:
	src/pingo/board.py
	src/pingo/ghost.py

Merge to sync.
Fixing minor error. And target hardware device testing.