Revert "Merge branch 'livedocx-2.0' of http://github.com/jonathanmaro…

…n/zf2 into merges/jonathanmaron-livedocx"

This reverts commit 239626850ab598a70f0b6008bdeb002c6f81a39f, reversing
changes made to 3addea5bec77bafc51fa1a9605a1c31a10f442f8.

src/Server/Fault.php

@@ -89,7 +89,7 @@ public function __construct(\Exception $e)
         // Notify exception observers, if present
         if (!empty(self::$_observers)) {
             foreach (array_keys(self::$_observers) as $observer) {
-                call_user_func(array($observer, 'observe'), $this);
+                $observer::observe($this);
             }
         }
     }