added missing displayException method.
added missing displayException method.

yappabe/cakephp-twig-view,simkimsia/TwigViewTemporary,WyriHaximus/TwigView,Adnan0703/TwigView,predominant/TwigView,alanrodas/TwigView,WyriHaximus/TwigView,m3nt0r/cakephp-twig-view