Use of django.utils.importlib deprecated in django 1.9

[lukeburden]

https://github.com/roverdotcom/django-inlinecss/blob/master/django_inlinecss/conf.py#L1

Throws a warning in Django 1.8, will result in an error in 1.9. Need to use python's native equivalent module "importlib".

[damacisaac]

+1

[Pavlov123]

Just made a pull request that resolves the issue.