code: function compileRegularHoliday(value) {
    if (typeof value === 'function') {
      return value;
  
    } else if (typeof value === 'string') {
      return stringToRegularHolidays(value);
  
    } else if (typeof value === 'number' &&  1 <= value && value <= 31) {
      var regular = {week: {}, day: {}, xweek:{}};
      regular.day[value] = true;
      return regular;
  
    } else {
      return {week: {}, day: {}, xweek:{}};
  
    }
  }
docs: 定休日をコンパイルします
  @param  {String} value
  @return {Object} regular