Price and selections for order items set in models
Order subtotal functions properly
App no longer has rails order_item form
User selections for carry through in edit mode

* For quantity and included ingredients
User selections carry through in edit mode

* For bagel type and cream cheese
Form has improved UX
User selections carry through in edit mode

* for meats and toppings
Bulk items only have bagel option
Order form fades in and view shifts to top
Users can customize a sandwich from build banner
Merge pull request #36 from devindreszer/js_form_updates

js order form improvements