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

acdha/django-modeltranslation,SideStudios/django-modeltranslation,vstoykov/django-modeltranslation,extertioner/django-modeltranslation,extertioner/django-modeltranslation,acdha/django-modeltranslation,SideStudios/django-modeltranslation,yoza/django-modeltranslation,marctc/django-modeltranslation,nanuxbe/django-modeltranslation,marctc/django-modeltranslation,deschler/django-modeltranslation,yoza/django-modeltranslation,akheron/django-modeltranslation,nanuxbe/django-modeltranslation,akheron/django-modeltranslation,deschler/django-modeltranslation,vstoykov/django-modeltranslation