connect direct charges not supported

I spotted that the service call function is not passing on all the parameters needed for connect direct charges, namely the stripe_account parameter. Have made the following changes to enable:

-  public function call($obj, $method = NULL, $params = NULL) {
+  public function call() {
+    $args = func_get_args();
+    $obj = array_shift($args);
+    $method = (count($args)>=1)?array_shift($args):NULL;
+    $params = (count($args)>=1)?$args:NULL;
+
     $obj = ucfirst($obj);
     $class = '\\Stripe\\' . $obj;
     if ($method) {
       try {
-        return call_user_func([$class, $method], $params);
+        return call_user_func_array([$class, $method], $params);
       }