Update demo document types to make test pass
Don't use auto_now_add for document defaults

Replacing auto_now_add with default=timezone.now makes it possible to
override the field value in tests.

See https://github.com/rbarrois/factory_boy/issues/102
Make jsonified test pass
Timezone error in some tests
Upgrade the document download url
TODO comment
Force exceptions for naive datetime warnings
Use tz aware date in document views
Download form: use correct queryset
Upgrade download tests with recent api