Add one-to-many Payment relationship to Order.
Deprecate the old getPayment and setPayment methods.
Fix comments.
Update payment listener and state resolver to loop through all payments.
Fix comments.
Change security token model to Payment.
Update last payment only.
Change OrderStatusAction to PaymentStatusAction.
Minor bug fix.
Fix comments.
Fix specs.
Fix more tests.
Add getLastNewPayment.
Fix comment.
Rename CaptureOrder classes to CapturePayment.
Merge pull request #1203 from kayue/feature/payment-order

Multiple payments support.