Add 1Wire support

[AlexR1973]

Please add 1Wire support.
Also update provided examples to be intact with source code.

Change Direction.OUTPUT to PinDirection.OUTPUT in the next lines:
Pin dc = GPIOBoard.ofPin(72, PinDirection.OUTPUT);

Change State.HIGH to PinState.HIGH in examples:
dc.write(PinState.HIGH);

[DigitalSmile]

Thanks for heads up with documentation, will do.
As of 1-wire, let's continue discussions in pi4j project, since I do not want to put efforts in both libraries.