fixed django 1.8 get_query_set deprecation warning
fixed django 1.8 get_query_set deprecation warning

arteria/django-watson,philippeowagner/django-watson,samuelcolvin/django-watson,dbaxa/django-watson,etianen/django-watson,samuelcolvin/django-watson,arteria/django-watson,dbaxa/django-watson,etianen/django-watson,philippeowagner/django-watson