removed obsolete code

lib/Twig/Template.php

@@ -27,11 +27,6 @@ abstract class Twig_Template
     const ARRAY_CALL = 'array';
     const METHOD_CALL = 'method';
 
-    /**
-     * @internal
-     */
-    protected static $cache = array();
-
     protected $parent;
     protected $parents = array();
     protected $env;

test/Twig/Tests/TemplateTest.php

@@ -390,7 +390,6 @@ class Twig_TemplateTest extends Twig_Template
     public function __construct(Twig_Environment $env, $name = 'index.twig')
     {
         parent::__construct($env);
-        self::$cache = array();
         $this->name = $name;
     }