Restored "createMock" back to deprecated "getMock". It worked for me, but not on Travis.

No time to argue with Travis, so it gets what works for it, for mow.

Author: judgej

tests/Message/AIMAbstractRequestTest.php

@@ -16,8 +16,8 @@ public function setUp()
         $this->request = $this->getMockForAbstractClass(
             '\Omnipay\AuthorizeNet\Message\AIMAbstractRequest',
             array(
-                $this->createMock('\Guzzle\Http\ClientInterface'),
-                $this->createMock('\Symfony\Component\HttpFoundation\Request')
+                $this->getMock('\Guzzle\Http\ClientInterface'),
+                $this->getMock('\Symfony\Component\HttpFoundation\Request')
             )
         );
     }