Added an empty models.py as Django requires this for tests.
Added an empty models.py as Django requires this for tests.

git-svn-id: b8e4c7d935891a2991ccbb3f654a3a46a1065c9f@145 eb01185e-fd33-11dd-bc25-5f29055a2a2d

COEXCZ/django-modeltranslation,COEXCZ/django-modeltranslation