added support for reference transaction in expres checkout

Author: davidkoberan

tests/Message/ExpressAuthorizeRequestTest.php

@@ -417,7 +417,7 @@ public function testGetDataWithBillingAgreementWrongPaymentType()
             '\Omnipay\Common\Exception\InvalidRequestException',
             "The 'paymentType' parameter can be only 'Any' or 'InstantOnly'"
         );
-        
+
         $billingAgreement = new BillingAgreement(false, 'Some Stuff', 'BadType', 'Some custom annotation');
     }
 }

tests/ProGatewayTest.php

@@ -20,7 +20,7 @@ public function setUp()
                 'lastName' => 'User',
                 'number' => '4111111111111111',
                 'expiryMonth' => '12',
-                'expiryYear' => '2016',
+                'expiryYear' => '2017',
                 'cvv' => '123',
             )),
         );

tests/RestGatewayTest.php

@@ -31,7 +31,7 @@ public function setUp()
                 'lastName' => 'User',
                 'number' => '4111111111111111',
                 'expiryMonth' => '12',
-                'expiryYear' => '2016',
+                'expiryYear' => '2017',
                 'cvv' => '123',
             )),
         );