flexget: disable SSL verification

For some reason, the root certificate for torcache.net is not in Debian
CA certificates. I don't care enough to add it, so just don't check SSL
certificates.
flexget: remove The Pirate Bay RSS for now
flexget: grab Brooklyn Nine-Nine
flexget: remove The Pirate Bay from search too
xbmc: try regular xbmc package
librarian: update munin dependency
librarian: update nginx dependency
nginx: don't use third-party repository

An update in nginx module seems to have changed where we should declare
the module not using an additional repository.