Updated .travis.yml with latest django versions (1.7.7, 1.6.11, 1.5.12)
Updated .travis.yml with latest django versions (1.7.7, 1.6.11, 1.5.12)

djangonauts/django-hstore,pombredanne/django-hstore,Stranger6667/django-hstore,pombredanne/django-hstore,Stranger6667/django-hstore,pombredanne/django-hstore,Stranger6667/django-hstore,djangonauts/django-hstore,djangonauts/django-hstore,pombredanne/django-hstore,djangonauts/django-hstore,Stranger6667/django-hstore