confirm payed order.
test ability.
add admin orders controller test.
show payment method in notify mail.
add order pay_with_bank_transfer method.
show invoice title.
change labels.
highlight invoice title.
add Ransack gem for search.
add ransack predicate.
search orders depends on ticket and price.
show submit refund form.
add paid amount and refunded amount to order.
add event order refund model.
config state from event order refund.
add event order refund observer.
add event order refund model test.
add tip to refund form.
save refund.
Merge pull request #571 from saberma/saberma-feature/570-order-pay-confirm

19屋管理员确认支付 #570