Start testing on Django 1.10a1 but allow failures

[edmorley]

As a precursor for supporting Django 1.10's new style of middleware, this PR:

• Adds some new end-to-end tests that catch issues with Django 1.10 that the existing unit tests did not.
• Makes the test runner use the new MIDDLEWARE setting rather than MIDDLEWARE_CLASSES under Django 1.10.
• Adds Django 1.10 to the Travis run, but allows failures (it's currently not passing).

See the individual commit messages for more details.

Another PR can then more easily iterate on adding support for the new style Django 1.10 middleware, by following: https://docs.djangoproject.com/en/1.10/topics/http/middleware/#upgrading-pre-django-1-10-style-middleware

Note: django-cors-middleware should already be compatible with Django 1.10 if used via the old-style MIDDLEWARE_CLASSES setting, it's only if users try to add it to MIDDLEWARE that they will see failures.

[codecov-io]

Current coverage is 94.54%

Merging #18 into master will not change coverage

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[vhf]

Hey, that's really great thanks!

We'll merge it shortly. Could you please walk us through what's still to be done in order to get 1.10a1 tests to pass?

We would also really appreciate if you could follow-up on making sure this module supports Django 1.10 in the future.

ping @gustavi

[edmorley]

We'll merge it shortly. Could you please walk us through what's still to be done in order to get 1.10a1 tests to pass?

I've added some notes in #19 :-)

[edmorley]

Thank you for merging!