Added shebang and executable permission to runtests.py.
Added PEP8 configuration to setup.cfg.
Renamed test files.

In Django 1.6, the default test runner was changed to DiscoverRunner which
ignores files whose filenames do not start with “test”.

The imports in __init__.py files are no longer needed in Django 1.6, but I’ve
preserved them to maintain compatibility with previous versions.
Merge pull request #6 from EE/test-running

Improved test running