Merge pull request #57 from rlerdorf/master

Fix a couple of small mistakes

Author: amacneil

src/Omnipay/Common/Message/AbstractResponse.php

@@ -106,6 +106,6 @@ public function redirect()
             exit;
         }
 
-        throw new RuntimeException('Invalid redirect method "'.$response->getRedirectMethod().'".');
+        throw new RuntimeException('Invalid redirect method "'.$this->getRedirectMethod().'".');
     }
 }