always use the most recent minor versions of django
don't need the patched mezzanine any more
use mezzanine that works on 1.4
Use a bytestring for the file content

So we don't have to deal with encoding across Django versions
Fixed test issues with fixto.js
Merge branch 'travis'

* travis:
  Fixed test issues with fixto.js
  Use a bytestring for the file content
  use mezzanine that works on 1.4
  don't need the patched mezzanine any more
  always use the most recent minor versions of django