import ZipStreamer using composer
adding zip streamer sources
add missing file
manual update according to master composer.json
Merge branch 'master' into add-zip-streamer

Conflicts:
	autoload.php
	composer.json
	composer.lock
	composer/autoload_real.php
	composer/installed.json
Merge pull request #72 from owncloud/add-zip-streamer

import ZipStreamer using composer