Add a11y test for the course home page.

Allow the "Default Group" to be renamed (automatic cohorting)

TNL-4324: Enhance linter for HTML() and Text()

ECOM-3198 Add banner image to the program listing program cards

- Add capability to run linter on file or directory
- Add rule for HTML() requiring Text()
- Add rule for HTML() and Text() being closed before format()
- Add rule for Text() unnecessary without HTML()
- Enhance expression parsing
- Add real arg parser for script
- Clean up unit tests

Introduce Pattern Library test pages (take two)

Lower padding on header for 320 breakpoint.

FEDX-88. Marking bok-choy test as flaky.

FEDX-93

These are developer only pages, so can not be seen in production
environment. On devstack, you can access these pages in LMS and
Studio at:

    /template/ux/reference/pattern-library-test.html

This is the second attempt to enable the Pattern Library. The
first attempt broke Django Templates and didn't work correctly
with right-to-left styling.

TNL-4355

Revert "Introduce Pattern Library test pages"

Add configurable name for verified track cohort.

Course Updates date validation

Adding i18n info for developers

Decreased the flakiness of upload_tar function

This reverts commit 845e3708.

Remove unused imports

Submission History safe by default

TNL-4115. Previously, course updates (which are intended to be posted with
dates, for sorting in the LMS) could be authored in studio with a valid
date, nothing, or a random string as the "date" for the update. As there
is no validation for this in studio, everything succeeded with no warning.

However, the LMS has problems parsing some of these values, and barfs when
loaded by learners.

The fix does two big things:
- gracefully handles invalid dates in LMS. These updates are now treated as
having a date of today, for sorting purposes.
- turns on validation in studio. Now, it is not only impossible to enter
invalid dates in studio, but notifications will draw the course author's
eye if any invalid updates were previously saved.

Test additions for this commit:

Adds:
- unit test for LMS parsing
- Jasmine test to confirm invalid dates cannot be set by the user
    -also adds event to setAndValidate instead of using a global object
- fix for lettuce test
    -It is no longer valid to enter the string "January 1, 2013" as this test
    had been doing. Keyed-in entries must use MM/DD/YY format.

Fix sequence navigation issues for CCX courses

Upgraded xblock-lti-consumer to 1.0.5

Stripping auth querystring from S3 URLs

asadiqbal08/WL-409 updated ubcpi version