add admin order fulfillments controller.
show order invoices.
add event order fulfillment model.
save order fulfillment.
validate fulfillment.
add order fulfillment feature test.
add email notification.
send email to user and organizer after send goods.
magic encoding fixed.
Merge pull request #597 from saberma/saberma-feature/manage-order-invoice

管理员录入公司票快递信息