Remove obsolete test file
Update setup.py - remove Django from install_requires
Update tests to use Django 1.6 test runner

See https://docs.djangoproject.com/en/1.6/releases/1.6/#new-test-runner
Also set DATABASE["TEST_NAME"]
Update tox.ini to use all supported Django versions
Update docs/changelog.rst
Merge branch 'fix-57-django-1.6-tests'