Merge branch 'hotfix/view-smart-collections-error'
test latest acts_as_list.
#473, support digital product.
#437, fixed new customer submit order error.
#437, fixed order email error.
#437, fixed rspec error.
#437, fixed rspec error.
#437, automatic click single payment gateway
show title link.
fixed create order error, revert previous rspec error.
#473, add integration test.
fixed #479, support alipay advance directly pay.
fixed rspec error.
fixed production alipay error.
add order show url.
add payed information.
#478, add order paid email notification.
#478, fixed rspec error.
use shop uniqueness scope.
fixed #483, variant quantity should be update correctly.
add api clients admin menu.