This reverts commit 5388d5d1.

This reverts commit 16e96365.

ECOM-4379

ECOM-4379

ECOM-4379

ECOM-2931

- API built atop Django REST Framework
- Added support for OAuth 2.0 and session authentication
- Added permissions around eligibility data

ECOM-2609

Please note that this is a squshed commit and the work of:
Symbolist, macdiesel, nedbat, doctoryes, muzaffaryousaf and muhammad-ammar

Also remove useless docstrings where they were added to keep pylint
quiet.

ECOM-2551

Fixed the issue when deleting a proctored exam attempt does not remove the record in the CreditRequirementStatus table

* Exclude orphaned XBlocks from requirements because they have been deleted.
* Sort ICRV requirements by start date, then by display name.

* Exclude orphaned XBlocks from requirements because they have been deleted.
* Sort ICRV requirements by start date, then by display name.

ECOM-1796
ECOM-1525

ECOM-1858

ECOM-1842

add 'fulfillment_instructions' for 'CreditProvider' model + add api method to get credit provider data
ECOM-1815

* Remove m2m relation between credit course and credit providers.
* Separate eligibility and provider APIs into different modules.
* Add API call for retrieving a user's eligibilities.
* Cache credit course list.
* Style the dashboard purchase button.
* Display a link for the credit provider on the dashboard.
* Add analytics events for clicks on the purchase button.
* Expose more credit models to Django admin and add search functionality.

Displayed eligibility line items on the Progress page of a Credit course
in the order of appearance in the courseware.

ECOM-1782

* Update credit eligibility when a user satisfies an eligibility requirement.
* Refactor set_credit_requirement_status arguments.
* Use django-simple-history to track requirement status changes.
* Refactor progress page by moving credit into a helper function and adding comments.

Use the number of seconds since the epoch (Jan 1 1970 UTC)
instead of an ISO-formatted datetime string.  This is easier
for credit providers to parse.

After receiving the response from software secure update the ICRV
requirement status in CreditRequirementstatus table.

ECOM-1602

1-Adding basic html for displaying eligibility table
2-Updated Eligibility Requirements Dynamically

ECOM-1523

* Add end-point for initiating a request for credit from a provider.
* Add an end-point for a provider to update the status of a request (approved / denied).

* Add Python API functions for creating and updating requests for credit.
* Add Django models and migrations for tracking credit requests and status.

Update credit Provider model and register in admin

ECOM-1555

* Add "reason" JSON-encoded field to CreditRequirementStatus.
* Add a "failed" status to CreditRequirementStatus.status choices.