Django-status

* Added compatibility with Django 1.10

* Add root view for status api.
* Use BASE_DIR instead of PROJECT_PATH to discover source code repo.+
* Change default checks to be able to override.

* Add source code stats.

* Fix setup.py problems with requirements file.

* Fix setup.py problems with utf-8 files.

* Fix checkers for celery and celery stats. Now displays if a worker isn't running.