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.
update spec file with magic_encoding_fix script
remove useless unless conditation in EventChange

In Event model, the 'where("users.phone is not null and users.phone != ''")'
has already excluded the possibility of phone being empty
Merge pull request #598 from loveky/master

两处小修改
Merge pull request #597 from saberma/saberma-feature/manage-order-invoice

管理员录入公司票快递信息
add index.
Merge pull request #599 from saberma/saberma-feature/manage-order-invoice

发票订单增加序号