Added Django install to Travis
Added Django install to Travis

rocketrip/django-jsonfield,dmkoch/django-jsonfield,natgeo/django-jsonfield,velfimov/django-jsonfield,thenewguy/django-jsonfield,hanuprateek/django-jsonfield,philippeowagner/django-jsonfield,anvil8/django-jsonfield,Natgeoed/django-jsonfield,SpazioDati/django-jsonfield,kazmiruk/django-jsonfield,bradjasper/django-jsonfield