code: function streamFileEntry(params, callback) {
    params.zipfile.openReadStream(params.entry, function(err, readStream) {
      if (err) {
        return callback(err);
      }
      // ensure parent directory exists
      var newFilePath = params.workingDir + "/" + params.entry.fileName;
      mkdirp(path.dirname(newFilePath), function(err) {
        if (err) {
          logger.debug("Error making directory " + newFilePath, err);
          return callback(err);
        }
        readStream.pipe(fs.createWriteStream(newFilePath));
        readStream.on("end", function() {
          params.zipfile.readEntry();
          callback();
        });
        readStream.on('error', function(err) {
          callback(err);
        });
      });
    });
  }
docs: streamFileEntry - Streaming a single uncompressed file from the zip file to the working folder.
  
  The folder structure of the zip file is maintained.
  
  @param  {object} params
  @param  {object} params.zipfile Reference to the parent zip file
  @param  {object} params.entry   Single Zip file entry
  @param  {string} params.workingDir Directory being unzipped into.
  @param  {function} callback
  @return {type}          description