code: function unzip(src, target, fn) {
      fs
          .createReadStream(src)
          .pipe(Unzip.Extract({path: target}))
          .on('close', fn || function(){})
  }
docs: 解压Zip
  @param    {String}   src     压缩包地址
  @param    {String}   target  解压缩目的地
  @param    {Function} fn      回调，可选
  @example  zip('./folder.zip', './test/folder' [, fn]);
  @date     2016-04-22 11:58