Adding basic modules for use.
Adding basic structure of train class.
Abstracting XpressNet Throttle control and train throttle values.
Abstracted Train class from HornbyXpressnet class
Adding usage example.
Moving usage example so it is outside of PyLint inspected packages.
Abstracting accessory class from controller.
Merge pull request #4 from robputt796/abstract_from_controller

Abstracting classes from controller.