new compareVersion method

exports.compareVersion

  var notSmaller, arrayA = versionA.split('-'), arrayB = versionB.split('-'), 
  minorA, minorB, mainA = arrayA[0].split('.'), mainB = arrayB[0].split('.'), 
  len = (mainA.length <= mainB.length) ? mainA.length : mainB.length;

  for (var i = 0; i < len; ++i) {
    if (parseInt(mainA[i], 10) < parseInt(mainB[i], 10)) {
      notSmaller = -1;
      break;
    } else if (parseInt(mainA[i], 10) > parseInt(mainB[i], 10)) {
      notSmaller = 1;
      break;
    } else if (i === len - 1) {
      if (mainA.length > mainB.length) {
        notSmaller = 1;
      } else if (mainA.length === mainB.length) {
        if (arrayA.length === arrayB.length === 1) {
          notSmaller = 0;
        } else if (arrayA.length > arrayB.length) {
          notSmaller = 1;
        } else if (arrayA.length < arrayA.length) {
          notSmaller = -1;
        } else {
          minorA = arrayA.reverse()[0].replace(/[a-zA-Z]/,'');
          minorB = arrayB.reverse()[0].replace(/[a-zA-Z]/,'');
          if (parseInt(minorA, 10) === parseInt(minorB, 10)) {
            notSmaller = 0;
          } else if (parseInt(minorA, 10) > parseInt(minorB, 10)) {
            notSmaller = 1;
          } else if (parseInt(minorA, 10) < parseInt(minorB, 10)) {
            notSmaller = -1;
          }
        }
      } else {
        notSmaller = -1;
      }
    }
  }

  return notSmaller;