Most of the changes to support this were merged some time ago; what
remains are these changes:
* Update requirements.txt
* Django 1.10: Upgrade success-http-headers.txt file.
- We no longer get the absolute urls, see
https://docs.djangoproject.com/en/1.10/releases/1.9/#http-redirects-no-longer-forced-to-absolute-uris
- The headers are capitalized, previously, they were in upper case.
* Bump PROVISON_VERSION to 3.0 since this is a disruptive change.
Fixes#3.
Travis CI seems to have changed the way the snakeoil SSL certs are
generated in their infrastructure, so we need to update our expected
"success" HTTP headers accordingly.