send notification to user after order created.
add shipping address info method.
add event order mail test.
add order mailer: notify_organizer_created.
notify organizer that order has created.
use background job to send email.
add order mailer: notify_user_paid.
send notification to user after order paid.
remove duplicated pay method.
dd order mailer: notify_organizer_paid.
send notification to organizer after order paid.
email content should not has pay_link if order is free.
add price unit.
Add scripts to find and fix file encoding
Add missing magic encoding comment
Add test to ensure no files miss magic encoding comment.
Merge pull request #523 from doitian/magic-encoding

Add scripts to find and fix magic encoding comment issues.
Merge branch 'master' into saberma-feature/464-send-notification-to-user-and-organizer-when-order-create-and-pay
fixed rspec error.
add utf-8.