Remove redundant call to #apply_promotions! within CheckoutCell.
Tidy up the template for checkout and add some classes for style hooks.
Fix invalid element IDs and add classes to checkout forms.
First cut of migating payment handling over to SpookAndPay.
Remove unused checkout form.
Update to pull masked number from SpookAndPay.
Remove the SpreedlyCore initializer.
Merge in fix-ordering branch.