Tests don't run

[ssteinerx]

Pulled the latest version with the fix to rename the directory due to the firebird library conflict.

Install from requirements.txt (once fixed, see)[https://github.com//issues/149].

Change directory to tests/test_main, where manage.py lives and run:

$ python manage.py test

And get this:

django.core.exceptions.ImproperlyConfigured: 'django.db.backends.firebird' isn't an available database backend or couldn't be imported. Check the above exception. To use one of the built-in backends, use 'django.db.backends.XXX', where XXX is one of:
    'mysql', 'oracle', 'postgresql', 'sqlite3'