Merge "WebVttRenderer: allow BOM at beginning of a WebVTT file." into klp-dev

    final private Phase mParseStart = new Phase() { // 5-9

        @Override

        public void parse(String line) {

            if (line.startsWith("\ufeff")) {

                line = line.substring(1);

            }

            if (!line.equals("WEBVTT") &&

                    !line.startsWith("WEBVTT ") &&

                    !line.startsWith("WEBVTT\t")) {