Merge pull request #18 from marlon-be/develop

Add support for Ogone Alias Manager and DirectLink
Add missing use statements in README file
Update README.markdown
corrected faulty indenting
Merge pull request #20 from marlon-be/pr/19

README updates
Recurrent payment should have the ECI parameter set to 9
added ECI as value object describing all possible values
Added mising fields for directLink without alias

For directLink, it's not necessary to set up an alias page. You can send the details yourself by sending the CARDNO, CVC and ED.
Add DirectLink Query and Maintenance request/response
Update README (DirectLink Query and Maintenance)
DirectLinkMaintenanceResponse should not filter out PAYIDSUB parameter
Fix integer validation in DirectLinkMaintenanceRequest::setAmount()
toArray method vanished from the PaymentResponse
Simplify the form generation by using a single static method
Static form generation test
Also implement static render method for UrlGenerator
Merge pull request #25 from peternijssen/master

Added mising fields for directLink without alias
Not static, just simplified
Move setBrand to AbstractPaymentRequest
Fix some whitespaces and MetaDocs