void Start()
{
GM = FindObjectOfType<GameManager>();
if ( Gamepad == null )
{
Gamepad = transform.GetComponentInChildren<Xbox360Gamepad>();
}
// Player controls.
Gamepad.LeftTriggerButton.Pressed.AddListener( PreviousNode );
Gamepad.RightTriggerButton.Pressed.AddListener( NextNode );
// Debug controls.
Gamepad.LeftBumperButton.Pressed.AddListener( CreateNode );
Gamepad.RightBumperButton.Pressed.AddListener( SkipTurn );
}