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.
travis-ci yaml can not accept no-ascii character.
add product show api.
show customer's company
fixed product collections name error.
add order email api.
support order field search.
update readme.
fixed #487, shop shows an error message[MySQL].
app config file was changed by mistake, revert it, #487.
#487, asset domain should be changed.
remove un-support webhook.
close #489, support alipay refund.
close #488, show order token in page source.