Added Toro::hashandlerfor function to check if a route is served or not

We needed a good way of checking if a route is served or not. So that we can serve different routes depending on user access.  

Sample code:

function GenHREF($href, $caption)
{
        /*
         * custom href that knows about toro-handlers
         * 
         * result if foo refers to a toro-handler :
         *        <a href=foo>bar</a>
         * result if foo doesn't refer to a toro-handler :
         *        bar
         */
        if (Toro::hashandlerfor($href))
                return "<a href='$href'>$caption</a>";
        else
                return $caption;
}