Add createRoute method for AnnotationClassLoader

This allows to use a custom route class. So if you want to support
annotations for Routing in Silex it can now be done while keeping the
custom routing options Silex supports.

src/Symfony/Component/Routing/Loader/AnnotationClassLoader.php

@@ -158,7 +158,7 @@ protected function addRoute(RouteCollection $collection, $annot, $globals, \Refl
             $condition = $globals['condition'];
         }
 
-        $route = new Route($globals['path'].$annot->getPath(), $defaults, $requirements, $options, $host, $schemes, $methods, $condition);
+        $route = $this->createRoute($globals['path'].$annot->getPath(), $defaults, $requirements, $options, $host, $schemes, $methods, $condition);
 
         $this->configureRoute($route, $class, $method, $annot);
 
@@ -259,5 +259,10 @@ protected function getGlobals(\ReflectionClass $class)
         return $globals;
     }
 
+    protected function createRoute($path, $defaults, $requirements, $options, $host, $schemes, $methods, $condition)
+    {
+        return new Route($path, $defaults, $requirements, $options, $host, $schemes, $methods, $condition);
+    }
+
     abstract protected function configureRoute(Route $route, \ReflectionClass $class, \ReflectionMethod $method, $annot);
 }