code: function (srcPath, options) {
          _.defaults(options || (options = {}), DEFAULT_OPTIONS);
          if(!this.isSpriteImage(srcPath, options)) {
              logger.error('is not SpriteImage. srcPath:' + srcPath);
              return [];
          }
  
          var separator = options.separator;
          var ratios = options.ratios;
          var group = this.getGroup(srcPath, options);
          var head = this.getHead(srcPath, options);
          var files = [];
          files.push(head + separator + group + '.styl');
          for (var i = 0; i < ratios.length; i++) {
              files.push('sprite' + separator + group + '@' + (ratios[i] * 10) + 'x.png');
          }
  
          return files;
      }
docs: After building, then to get the files that are created
  @param {String} srcPath
  @param {Object} options
  @returns {Array}
  var srcPath = 'test/image/sprite/sprite-logo-hoge.png'
  var options = {
  separator: '-',
  ratios: [ 1, 2 ]
  };
  var out = getCreateFile(srcPath, options):
  console.log(out);
  > [ 'sprite-logo.styl', 'sprite-logo@10x.png', 'sprite-logo@20x.png' ]