adding support for custom cacert.pem file to support barclays certifi…

…cate that is not supported in guzzle 3.9

src/Omnipay/BarclaysEpdqDl/AbstractGateway.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace Omnipay\BarclaysEpdqDl;
+
+use Guzzle\Http\Client as HttpClient;
+use Omnipay\Common\AbstractGateway AS OmnipayAbstractGateway;
+
+abstract class AbstractGateway extends OmnipayAbstractGateway
+{
+    /**
+     * Get the global default HTTP client.
+     *
+     * @return HttpClient
+     */
+    protected function getDefaultHttpClient()
+    {
+        return new HttpClient(
+            '',
+            array(
+                'curl.options' => array(CURLOPT_CONNECTTIMEOUT => 60),
+                'ssl.certificate_authority' => __DIR__ . '/Resources/cacert.pem'
+            )
+        );
+    }
+}

src/Omnipay/BarclaysEpdqDl/Gateway.php

@@ -2,7 +2,7 @@
 
 namespace Omnipay\BarclaysEpdqDl;
 
-use Omnipay\Common\AbstractGateway;
+use Omnipay\BarclaysEpdqDl\AbstractGateway;
 use Omnipay\BarclaysEpdqDl\Message\PurchaseRequest;
 
 /**