Update __init__.py

[andytwoods]

Without that explicit location, unit tests fail in Django. Please see http://stackoverflow.com/questions/39588380/django-celery-unit-tests-with-pycharm-no-module-named-celery/39655850#39655850

[auvipy]

build is failing

[ask]

There's nothing called taskapp in the Django example.

I'm guessing this is for a project that uses a separate Django app for the celery app...