Choose Your Own Adventure assignment submission

@jwo The Book#complete_game? does not work in that it also gives the conclusion as selectable "option".
I.e. You have to be on the actual last page which has ``` Page.create(conclusion: true,... ``` before the loop exits.
Is that why the Eagle Assignment ask to:
1. Refactor so that the page doesn't have a parent -- instead it stores the id's of its options (option_a_id, option_b_id)?