MoreIndexingFilter refactor: move data formats used to parse "lastModified" to a config file.

  public void setConf(Configuration conf) {
    this.conf = conf;
    MIME = new MimeUtil(conf);
    
    URL res = conf.getResource("date-styles.txt");
    if(res==null){
      LOG.error("Can't find resource: date-styles.txt");
    }else{
      try {
        List lines = FileUtils.readLines(new File(res.getFile()));
        for (int i = 0; i < lines.size(); i++) {
          String dateStyle = (String) lines.get(i);
          if(StringUtils.isBlank(dateStyle)){
            lines.remove(i);
            i--;
            continue;
          }
          dateStyle=StringUtils.trim(dateStyle);
          if(dateStyle.startsWith("#")){
            lines.remove(i);
            i--;
            continue;
          }
          lines.set(i, dateStyle);
        }
        dateStyles = new String[lines.size()];
        lines.toArray(dateStyles);
      } catch (IOException e) {
        LOG.error("Failed to load resource: date-styles.txt");
      }
    }
  }

  private long getTime(String date, String url) {
    ......
    Date parsedDate = DateUtils.parseDate(date, dateStyles);
    time = parsedDate.getTime();
    ......
    return time;
  }