Django 1.10

[Saint Germain]

Hello,

As described in this issue:
https://github.com/django-oscar/django-oscar/issues/2072

I've made some changes based on pxg work to try Oscar with Django 1.10.
I only made some quick & dirty changes, without checking the embedded
tests, but the basics seem to work.

Hope that can be useful for Oscar developers.

Regards,