Establish a fixed set of links for a code walkthrough of the changes …

…for iframed credit card field PCI compliance changes

Update BROKER_URL default value

(cherry picked from commit fc0a0ce)

Upgrade Django to 2.2.15

DISCO-1643: Making some improvements around supporting Honor (openedx…

…-unsupported#2992)

This includes a potential bug fix around adding additional honor
seats, not having the option of adding an honor seat to a Verified
Only course, and correctly showing Verified and Honor courses as
Verified instead of Verified Only.

(cherry picked from commit fa3ff81)

Upgrade Django to 2.2.13

Upgrade pin on django-oscar, pin edx-auth-backends, and run make upgrade

Upgrade pin on django-oscar, pin edx-auth-backends, and run make upgrade

Upgrade pin on django-oscar, pin edx-auth-backends, and run make upgrade

added assignment email api

added assignment email api