Configuration models: now a separate Django app & repository

[John Eskew]

As a result of a hackathon project last fall, the "config-models" Django application moved from its location inside edx-platform to a separate repository here:

https://github.com/edx/django-config-models

Implications of this change:

- The edx-platform repository no longer has the config-models code - it's in the new repository and is installed as a separate Django application into edx-platform.

- The config-models tests in the separate repo are no longer run for every edx-platform CI test cycle.

- config-models can now be used in your favorite Django application. These models offer the following features:

    - Django models backed by storage backend

    - Editable in the Django admin interface

    - Represent individual configuration values checked at run-time

    - Enabled/disabled values

    - Audit trail of who changed the values and when they were changed

To learn more about config-models and how they might help your application manage configuration, search for "ConfigurationModel" in the edx-platform codebase and see the README here:

https://github.com/edx/django-config-models/blob/master/README.rst

The commit history of the code was not carried over to the new repository. To see the previous commit history for the code, check here:

https://github.com/edx/edx-platform/commits/release-2016-10-12/common/djangoapps/config_models

FYI,

John