code: function (numeral) {
    var matches = numeral.match(/([b#]?)([iIvV]+)/);
    var halfSteps = interval.parse(_.indexOf(romanNumeral, matches[2]).toString()).halfSteps();
  
    if (matches[1] === 'b') halfSteps -= 1;
    if (matches[1] === '#') halfSteps += 1;
  
    return halfSteps;
  }
docs: Given a roman numeral, return the number of half steps