Fix typo

Author: kylekatarnls

src/Jade/JadeSymfonyEngine.php

@@ -25,7 +25,7 @@ public function __construct($kernel)
         }
         $this->jade = new Jade(array(
             'prettyprint' => $kernel->isDebug(),
-            'extension' => '.pug',
+            'extension' => array('.pug', '.jade'),
             'cache' => $cache
         ));
         foreach (array_slice(func_get_args(), 1) as $helper) {

src/Pug/PugSymfonyEngine.php

@@ -4,6 +4,6 @@
 
 use Jade\JadeSymfonyEngine;
 
-class JadeSymfonyEngine extends JadeSymfonyEngine
+class PugSymfonyEngine extends JadeSymfonyEngine
 {
 }