Moved DPMAuthorizeResponse to DPMResponse as it serves as DPMPurchaseResponse too

Author: judgej

src/Message/DPMAuthorizeRequest.php

@@ -56,6 +56,6 @@ public function getData()
      */
     public function sendData($data)
     {
-        return $this->response = new DPMAuthorizeResponse($this, $data, $this->getEndpoint());
+        return $this->response = new DPMResponse($this, $data, $this->getEndpoint());
     }
 }

src/Message/DPMAuthorizeResponse.php renamed to src/Message/DPMResponse.php

@@ -7,11 +7,11 @@
 use Omnipay\Common\Message\RedirectResponseInterface;
 
 /**
- * Authorize.Net DPM Authorize Response
- * Here we want the application to present a POST form to the user. This object will
+ * Authorize.Net DPM Authorize and Purchase Response
+ * We want the application to present a POST form to the user. This object will
  * provide the helper methods for doing so.
  */
-class DPMAuthorizeResponse extends AbstractResponse implements RedirectResponseInterface
+class DPMResponse extends AbstractResponse implements RedirectResponseInterface
 {
     protected $postUrl;