Internationalize our use of jquery.timeago

Encode periods and $ in block_id map

Also get rid of an unused template and extra copies of jquery.timeago.

Use a version of ddt that supports unicode w/o requiring six at runtime

Documentation accessibility

Alt tags added to for all images. For STUD-1041

Bok-choy fixtures, Studio tests, and (some) ORA tests

i18n: externalize strings in discussion forums templates and python code...

Course Start Date Changes

Added doc for file sorting change

JIRA: FOR-398, FOR-399

Add forum tests for non-ASCII data

First PR!  Added myself to the AUTHORS file

Sylvia/documentation/ora updates

Add documentation of LMS/Studio features usable by XBlocks

[LMS-192]

JSON serialization error fixed.

Replace authz with roles.py and reconcile their behaviors

Fix typo in the announcement template

ORA-195

Added fixtures for course and xblock creation
Added bok-choy Studio tests
Added bok-choy tests for ora self- and ai- assessment
Refactored auto-auth; added staff and course-enrollment options
Removed extra javascript properties from page objects

Verified Certificate Reports

Anton/fix negative exponents

Set default tolerance to 1e-3% for all responsetypes.

Anton/allow arbitrary regex in stringresponse

Refer to a ddt commit that actually exists (merging to unbreak master)

add FAQ link to course_about error msg

use double-quotes, not single

STUD-1006

Add "All peer grading must be done by due date" information