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Added getRequestTransactionId() to SagePay\Message\ServerCompleteAutorizeRequest
So that the receiving code can look up the right transactionReference and call setTransactionReference() before getData() is called as it needs the SecurityKey from the transactionReference to check the message signature
added various access methods on SagePay\Message\ServerCompleteAuthorizeResponse to ease accessing the transaction infomation. Also includes comments explaining the contents of the fields, retyped from the 23 Aug 2011 version of the SagePay Server Protocol Integration Guidelines document
Merge branch 'dev_to_core' into dev
started trying to implement token system for SagePay
Merge branch 'dev_to_core' into dev

Conflicts:
	src/Omnipay/SagePay/Message/ServerCompleteCreateCardRequest.php
	src/Omnipay/SagePay/Message/ServerCompleteCreateCardResponse.php
	src/Omnipay/SagePay/Message/ServerCreateCardResponse.php