Enable running of tests using `python example/manage.py test`
sylink to the app, not to the individual files
Prevent 500.html required errors with runserver
Check that future and past can't be set together
Test sringification and repr of future and past
Add comparison tests for past
Update length test
Add handling of 'past' to formfields
Merge pull request #3 from evdb/master

Add 'past' as an attribute