Ongoing experiment to get it to work with 1.5
Set `sys.argv` to keep the `'test' in sys.argv` convention working.

Some `settings.py` configurations test for the `'test'` command line argument to switch settings for tests; by setting `sys.argv` directly the `bin/test` command cooperates with those.
Merged Martijn's fix in https://github.com/mjpieters/djangorecipe/commit/d4fe0d92fac45b65d760afee63741f14ae829abf

Helps some test scripts