'Returns a dict representing the false values of this profile.
Parameters:
- `prefix` - a string prepended to the key name. Helpful if being used
to traverse relations
This only includes keys for which the profile is False, which is useful
for querying apps where we want to filter by apps which do not require
a feature.
>>> profile = FeatureProject.from_signature(request.get(\'pro\'))
>>> Webapp.objects.filter(**profile.to_kwargs())'

def to_kwargs(self, prefix=''):

    return dict((((prefix + k), False) for (k, v) in self.iteritems() if (not v)))
