Revert "cast header value to an object so that batchSize works in a q…

…uery"

This is not needed if the WSDL has the correct elements for queryMore.

This reverts commit b82be72.

lib/API.php

@@ -237,7 +237,7 @@ public function setQueryOptions($batchSize){
         $header = new SoapHeader(
         	'http://api.zuora.com/',
         	'QueryOptions',
-            (object) array(
+            array(
             	'batchSize'=>$batchSize
             )
         );