Added Html redirect support for RequiredRole

As per: http://stackoverflow.com/questions/17235947/requiredrole-razor2-and-html-redirect/17239023?noredirect=1#comment24979592_17239023

@mythz said he will modify it to look at Config.CustomHttpHandlers for any rules defined for HttpStatusCode.Forbidden
Added support for Html Redirect
Added support for Html Redirect
Added support for Html Redirect
Merge pull request #737 from discens/patch-1

Added HtmlRedirect support to RequiredPermision, RequiredRole, RequiresAnyPermission and RequiresAnyRole