[action] add notify order action.
Merge pull request #249 from formapro-forks/notify-order-action

[action] add notify order action.
Release 0.12.6
Merge branch '0.12'

Conflicts:
	src/Payum/OmnipayBridge/OnsitePaymentFactory.php
	src/Payum/OmnipayBridge/PaymentFactory.php
	src/Payum/Paypal/ProCheckout/Nvp/PaymentFactory.php