Make serializer configurable

src/RestableServiceProvider.php

@@ -45,9 +45,16 @@ class RestableServiceProvider extends ServiceProvider
 
             $converter = new Format;
 
+            $manager = new FractalManager;
+            if ($serializer = config('restable.serializer')) {
+                $manager->setSerializer(
+                    new $serializer
+                );
+            }
+
             return new FractalDecorator(
                 new SelfRenderedAdapter(new Restable($app['config'], $response, $converter)),
-                new FractalManager
+                $manager
             );
         });
     }