tentative working Django 1.7.1 (bug 935538)

* wip don't merge
* removed funfactory and test_utils

- [x] tests seem a bit slower, mocking might be failing
- [x] need to check on the django-tastypie pinning
- [x] need to run baked
It can, the list of what it accepts is actually a bit long. But PriceForm can have multiple errors because it has multiple fields. These all then get passed up as an error on the `prices` field.