Fix incorrect exclude patterns in prepare_portable script
Do not exclude unittest from bundled modules for portable

Apparently django.contrib.auth now needs unittest (at least
in Django-1.5c1) so we can no longer exclude it.
Updated portable build scripts.
MANIFEST.in: updated file structure
prepare_portable.py: groups_de.json no longer available in fixtures. Added new site-packages tornado and qrcode.
Merge branch 'portable' of https://github.com/andkit/OpenSlides into portable