View: Register our own view helper path

That's a different path than application/views/helpers because this one
uses a namespace so that we're able to extend Zend's view helpers

library/Icinga/Web/View.php

@@ -4,6 +4,7 @@
 namespace Icinga\Web;
 
 use Closure;
+use Icinga\Application\Icinga;
 use Zend_View_Abstract;
 use Icinga\Authentication\Auth;
 use Icinga\Exception\ProgrammingError;
@@ -92,6 +93,8 @@ class View extends Zend_View_Abstract
             }
         }
 
+        $config['helperPath']['Icinga\\Web\\View\\Helper\\'] = Icinga::app()->getLibraryDir('Icinga/Web/View/Helper');
+
         parent::__construct($config);
     }