ECOM-4379

ECOM-2931

There is no need for a separate migration for the validation. Updated the regex in the initial migration to appease Django.

ECOM-2609

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

ECOM-1796
ECOM-1525

ECOM-1842

Adds the "order" field that was introduced in 0011 to the "models"
dictionary of migrations 0012 and 0013 so South knows that
the field should exist after 0011 is run.

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

Adds the "order" field that was introduced in 0011 to the "models"
dictionary of migrations 0012 and 0013 so South knows that
the field should exist after 0011 is run.

* 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.

* 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.

The CreditRequirement "configuration" field was renamed in Django
code without updating the migration.  This commit adds a second
migration to delete the incorrect field and add a new field.
The credit feature is currently disabled in production, so
the model isn't currently used by application code.