PHPZipStreamer
  ==============
  
  Simple Class to create zip files on the fly and stream directly to the HTTP
  client as the content is added (without using temporary files).
  
  Copyright (C) 2013-2014 Nicolai Ehemann (en@enlightened.de)
  Contributors: André Rothe (arothe@zks.uni-leipzig.de)
  
  Licensed under the GNU GPL. See COPYING for more information.