introduced a new FeedbackResponse and refactored Response related classes
fixed incorrect documentation and docBlock
created a payment.ogone service to handle feedback responses (callback)
added getAmount(), getStatus() and getPaymentId() methods to ResponseInterface, and moved hash related classes to a dedicated namespace
removed duplicate param
added payment.ogone usage example
ResponseInterface methods become abstract so that we don't need to throw exceptions to force sub-classes' implementations
added licence and class docBlock
Merge pull request #16 from ETSGlobal/handle-feedback-response

Handle feedback response