May resolve issue #231

https://github.com/kmmbvnr/django-jenkins/issues/231

The assumption that the models path is the same as the app path is incorrect when there is models package instead of just a file.

Line 131 was changed so that ./manage.py jenkins myapp.test.ViewTests.specific_test would run without problems. I would understand if this wasn't desired for other people but it fit my use case.