System check identified some issues:

WARNINGS:
?: (1_6.W001) Some project unittests may not execute as expected.
HINT: Django 1.6 introduced a new default test runner. It looks like this project was generated using Django 1.5 or earlier. You should ensure your tests are all running & behaving as expected. See https://docs.djangoproject.com/en/dev/releases/1.6/#new-test-runner for more information.

Решение: добавить строку в settings:

TEST_RUNNER = 'django.test.runner.DiscoverRunner'

AttributeError: 'Apps' object has no attribute 'app_store'

Решение удалить в settings.py приложение 'South' оно уже встроено по умолчанию с версии 1.7