If the YouTube API JS fails to load, the rest of the JS should still run

Sarina/enhance user factories

Fixes BLD-472

Removed duplicate code

Enabled course id clash command tests

Flowerhack/feature/refunds for certificates

Avoid CS search endpoint for non-search queries

adds a new option to ungenerated_certs to use http in the callback url

adding create_user script

* Changed text for "Are you sure you want to refund"...
* Addressed a CR comment adding clarity to student view code
* Converted UTC to pytz.utc

Determine which mode was selected more intelligently.

"Public Display Name" -> "Public Username" on registration page [LMS-139...

User menu a11y changes to allow use of spacebar, escape key and arrows to navigate

Verified Certificate Reverification Path

Pin dateutil version to 2.1

remove instances of @edx.org email addresses in our default settings (Bug: LMS-1363)

LMS-1384

Alex/add latex compiler key

BLD-426