Sed-replaced all those references to nani in hvad modules. No more
spurious deprecation warnings while using hvad modules.
Added old nani-language-tabs alongisde hvad-language-tabs for backward compatibility.
Merge pull request #137 from spectras/master

Stop deprecation warnings when correctly importing only hvad modules.
Changed the lazy_translation_getter to take advantage of the prefetch_related.
Upgraded django versions.
Merge branch 'master' of github.com:linovia/django-hvad