Also display raw response when this test fails as it contains the err…

…or message

tests/PHPUnit/Core/JsProxyTest.php

@@ -39,7 +39,7 @@ function testPiwikPhp()
 
         $this->assertEquals(
             "R0lGODlhAQABAIAAAAAAAAAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==",
-            base64_encode($fullResponse),
+            base64_encode($fullResponse) . "\n\n\n\nRaw content: \n\n\n" . $fullResponse,
             'checking for image content'
         );
     }