Merge pull request #13616 from owncloud/streamresponse

lib/private/appframework/app.php

lib/private/appframework/dependencyinjection/dicontainer.php

lib/private/appframework/http/dispatcher.php

lib/private/appframework/http/output.php

lib/public/appframework/http/icallbackresponse.php

lib/public/appframework/http/ioutput.php

lib/public/appframework/http/streamresponse.php

tests/lib/appframework/AppTest.php

tests/lib/appframework/http/StreamResponseTest.php