GPIO service class

[allebb]

A new GPIO service class should be created to read and write to the GPIO logical/in-memory filesystem to enable class-less access to these pin values.

Great documentation on how this can be achieved can be found at the following URLs:

• https://luketopia.net/2013/07/28/raspberry-pi-gpio-via-the-shell/
• http://www.susa.net/wordpress/2012/06/raspberry-pi-relay-using-gpio/

The service class should also be able to function on other systems that do not run on the RaspberryPi and as such, come packaged with a VFS (virtual filesystem) handler.

[allebb]

I have now decided to instead make this a separate public repository that can be downloaded using Packagist etc.

Full unit tests will also be provided and will use a similar virtual file system to that of this library:- https://github.com/PiPHP/GPIO

[allebb]

This has now been created and can be found here: https://github.com/allebb/gpio