hybridgroup/artoo — pull request #143 by davispuh (2014-11-22 01:01:54+00:00)
Title: When closing pin, turn it off

```ruby
work do
led.on
end
```

Currently even after shutting down robot, LED will stay on even if GPIO have been unexported and isn't accessible anymore.

This PR fixes it so when PIN is closed it will be turned off.