add china_city gem.
init china_city.
add convenient css method: margin-right.
add event order shipping address model.
save order address in model and controller.
save order address.
fixed rspec error.
merge master.
validate shipping address at server.
add refunding and refunded status
remove canceled_at
validate order quantity and address on create.
Merge pull request #511 from saberma/saberma-feature/463-save-order-shipping-address

用户可以录入发票收货地址等信息 #463
add user refund link
merge master but ruby&js code has 2004 lines greater than 2000
pending >2000 spec
send notification to user after order created.
add shipping address info method.
add event order mail test.
add order mailer: notify_organizer_created.