function onGlobError(err) {
    this.emit('error', err);
  }
Appends multiple files that match a glob pattern.

@param  {String} pattern The [glob pattern]{@link https://github.com/isaacs/node-glob#glob-primer} to match.
@param  {Object} options See [node-glob]{@link https://github.com/isaacs/node-glob#options}.
@param  {EntryData} data See also [ZipEntryData]{@link ZipEntryData} and
[TarEntryData]{@link TarEntryData}.
@return {this}