Duranda's History checkUrl fix

DurandalHistoryCheckUrl

    /**
     * Checks the current URL to see if it has changed, and if it has, calls `loadUrl`, normalizing across the hidden iframe.
     * @method checkUrl
     * @return {boolean} Returns true/false from loading the url.
     */
    function cleanFragment(s) {
        return s
            .replace(/%7E/g,  "~")
            .replace(/%21/g,  "!")
            .replace(/%2A/g,  "*")
            .replace(/%28/g,  "(")
            .replace(/%29/g,  ")")
            .replace(/%27/g,  "'")
            .replace(/%2D/g,  "-")
            .replace(/%2E/g,  ".")
            .replace(/%5F/g,  "_")
    }
    history.checkUrl = function() {
        var current = history.getFragment();
        var compareCurrent = cleanFragment(current);
        var historyFragment = cleanFragment(history.fragment);
        if (compareCurrent === historyFragment && history.iframe) {
            current = history.getFragment(history.getHash(history.iframe));
        }

        if (compareCurrent === historyFragment) {
            return false;
        }

        if (history.iframe) {
            history.navigate(current, false);
        }

        history.loadUrl();
    };