Resolves selahattinunlu#52: Query Builder pagination options passing.

- Added additional step for identification current page before processing pagination query in the `QueryBuilder::basePaginate` method. It needs, because the `QueryBuilder::basePaginate`  is private and is called only once and only in this class. The method calls without `$page` parameter passing, so that the `$page` will always be `1` and the `Paginator::items` will have incorrect items.

src/QueryBuilder.php

@@ -409,7 +409,9 @@ private function addAppendsToModel($result)
      */
     private function basePaginate($perPage = null, $columns = ['*'], $pageName = 'page', $page = null)
     {
-        $page = $page ?: BasePaginator::resolveCurrentPage($pageName);
+        if (is_null($page)) {
+            $page = $this->page ?: BasePaginator::resolveCurrentPage($pageName);
+        }
 
         $perPage = $perPage ?: $this->model->getPerPage();