Left/right key control

[tshedor]

• Pressing the left or right arrow key (keycodes 37, 39) should advance or revert the current page.
• OPTION: disableArrowKeys : when true, arrow keys do not control the current page. Accepts: Boolean. Default: false.
• This functionality should not fire when the "book" is unmounted.
• This functionality should only fire once per instance.
• When multiple "books" are present on a single page, only the last interacted book will be controlled.