merged branch jonathaningram/patch-2 (PR #2855)

Commits
-------

7827f72 Fixes #2817: ensure that the base loader is correctly initialised

Discussion
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[TwigBundle] Ensure base Filesystem loader paths are initialised

Bug fix: yes
Feature addition: no
Backwards compatibility break: no
Fixes the following tickets: #2817

Originated from #2817.

src/Symfony/Bundle/TwigBundle/Loader/FilesystemLoader.php

@@ -33,6 +33,8 @@ class FilesystemLoader extends \Twig_Loader_Filesystem
      */
     public function __construct(FileLocatorInterface $locator, TemplateNameParserInterface $parser)
     {
+        parent::__construct(array());
+
         $this->locator = $locator;
         $this->parser = $parser;
         $this->cache = array();