merged branch hason/tests_autoloader (PR #994)

This PR was merged into the master branch.

Discussion
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Fixed autoloader registration for tests if phpunit is installed as package together with Twig

Commits
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19869ce Fixed autoloader registration for tests if phpunit is installed as package together with Twig

diff --cc lib/Twig/Autoloader.php
index c36a4c7,736605d..9b437fa
--- 1/lib/Twig/Autoloader.php
--- 2/lib/Twig/Autoloader.php
+++ b/lib/Twig/Autoloader.php
@@@ -18,10 -18,17 +18,16 @@@ class Twig_Autoloade
  {
      /**
       * Registers Twig_Autoloader as an SPL autoloader.
+      *
+      * @param Bolean $prepend Whether to prepend the autoloader or not.
       */
-     public static function register()
+     public static function register($prepend = false)
      {
-         spl_autoload_register(array(new self, 'autoload'));
 -        ini_set('unserialize_callback_func', 'spl_autoload_call');
+         if ($prepend && version_compare(phpversion(), '5.3.0RC1', '>=')) {
+             spl_autoload_register(array(new self, 'autoload'), true, $prepend);
+         } else {
+             spl_autoload_register(array(new self, 'autoload'), true);
+         }
      }
  
      /**