Add `assertInContext` method.

This is being promoted from its former life in `arm_wells.tests._utils.py.TestCase`.
Merge pull request #9 from joncotton/assertInContext

Add `assertInContext` method.
Update to include assertInContext (v1.11.0)
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Adjust the settings reset to work with Django 1.4

Django changed the `settings._wrapped` value from `None` to the special
`empty` object.  This change maintains backwards compatibility for
1.3.X, while using the new method for all other versions of Django.
Merge pull request #10 from tswicegood/work-with-1.4

Adjust the settings reset to work with Django 1.4
Make compatible with Django 1.4 (v1.12.0)
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Make sure to install Django of some flavor when this is installed
Merge tag 'v1.12.1'
Removing Django requirement entirely (v1.13.0)
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