Allow .html files in the static pipeline

TNL-3296

Hotfix/2015 09 16

- Updated checkout page to disallow purchase of credit seats (the credit payment page is hosted in ecommerce)
- Corrected path to providers endpoint
- Cleaned receipt page styling
- Updated receipt page copy
- Added provider thumbnail to receipt page

ECOM-2172

Rc/2015 09 15

Adam/patch rc with fix to fix not found

(PLAT-835)
(TNL-844)

mattdrayer/signatory-title-textarea: Increase form input limit to 106…

mattdrayer/signatory-title-length: Bump to 106 characters

* Fix typo
* Fix odd test inputs

Add error handling for elastic search.

Fix duplicate calls to search API

Dan f/make teams tabs accessible

TNL-3150

Fixing bad button style

TNL-3198

Also fixed a regression with the search breadcrumbs
where it wasn't possible to navigate back to the
full list.

Removing unneeded styling on confirmation button; making the
appearance and hover/focus behavior of the button match that
of the confirmation dialog in studio.

TNL-3189

fix error where users who received a no-id-professional certificate did not get a link on his/her dashboard to download the PDF

Fix add component buttons to be backward compatible

Fixed discussion module get_course.

Update edx-search release & a11y for teams

TNL-3237

Update teams breadcrumb aria-label, make team membership display as a
<ul>, fix contrast issues, and remove an extraneous angle bracket.

Add edx-search configuration to lms

remove django-threaded-multihost

remove "defensive code" until we can figure out how to actually
catch the errors,

Prevent over-expansion of team memberships.

SOL-1187: missing is_active attribute fix

Fix syntax error in teams_tab_spec.js

TNL-3202

Fix and cleanup of API doc