remove instances of @edx.org email addresses in our default settings

Bug: LMS-1363
BLD-205: fix total count.
Add barebones reverification flow.
Add tests for some of the new views.
Add new user_status functionality to PhotoVerification.
Put in a dummy verification status into the dashboard.
Fix settings for verification statuses on the student dashboard
LMS: adds in styling and base UI for reverification flow
LMS: removing non production-friendly messages
LMS: revises semantics and styling for dashboard messages
LMS: revises re-verification instruction UI and help text
LMS: revises UI states for verification status in dashboard view
Add hooks for other statuses onto the dashboard
Wire up new statuses onto the dashboard.

LMS-1133
Add in human-readable text for error messages.

LMS-1133
Hide certificates section if enrolled as audit.

LMS-1133
Make export URL restful.

STUD-846
Improve accessibility of forum follow buttons

They now include screen reader-friendly text, have the ARIA checkbox
role, activate on keypress (for space or enter), and occur in the DOM
after the header information (title, etc.)
Update error messages and copy for re-verification flow
Remove DAYS_GOOD_FOR from being a class variable.

LMS-1387