[payum] do not submit form on GET request.
fix #1313
Fix NumberListener, fixtures and add scenario
Merge pull request #1538 from formapro-forks/payum-fix-obtain-credit-card-action

[payum][credit card] do not submit form on GET request.
Merge pull request #1560 from winzou/fix/number

Fix order number generation
Refactored sequence generator to be more flexible

Conflicts:
	src/Sylius/Bundle/OrderBundle/Resources/config/driver/doctrine/orm.xml

Conflicts:
	src/Sylius/Bundle/SequenceBundle/Doctrine/ORM/NumberListener.php
Extend previous changes for sequences code to replace Coupon generator with new code
Refactor code a bit more after feedback, add missing changes into specs