v0.7.4

• adds a MongoDB broker
• adds Django 1.9 compatibility

Notes:
Django 1.9 is very strict with model imports in the app root.
So when you are using Django 1.9 you will have to import from the relevant submodules.
i.e. from django_q import async becomes from django_q.tasks import async.
This has also been changed in the Docs and will be the standard moving forward, but the root imports remain available for Django 1.7 and 1.8.