function showTopic(ForumTopic $topic)
 {
     $topic->views++;
     $topic->save();
     $topic->markAsRead(Auth::user());
     if (Auth::user()->canAccessTopic($topic->id)) {
         return View::make('forums/viewTopic')->with('topic', $topic);
     } else {
         return App::abort(404);
     }
 }