Fix error during report generation

Generating a report was resulting in "LaTeX
Error: Command \nobreakspace unavailable in encoding EU1".

The fix is based on http://tex.stackexchange.com/a/78767/21277 .
Simple upgrades.
Celery 3.1, librarian update
GzipPipelineCachedStorage from fnpdjango.
Merge remote-tracking branch 'origin/production'