Add a simple django contrib app to allow locally filtering querysets

[agateblue]

Assuming the app is configured correctly:

INSTALLED_APPS ) = [
    'lifter.contrib.django',
]

One should be able to use lifter's python backend to manipulate queryset locally, without calling the database:

# django qs
qs = User.objects.filter(date_joined__year=2016)

# local sorting using lifter
qs.locally().order_by('-date_joined')