Updated JS comments
Removed white space
Updated global checkout JS for new discount Ajax. #715
Updated edd_ajax_apply_discount() for new ajax. #715
Updated edd_get_cart_discounted_amount() for new ajax. #715
Added new edd_get_cart_discounts_html() function. #715
Added new edd_remove_cart_discount() function. #715
Updated discount section of checkout_cart.php. #715