turn on bok choy XSS checking

WL-450 Fix for issue with canceling changes to image upload fields

Disable `Generate Exception Certificate button

Christina/mark flaky tests

Fix another kind of math problem which was overflowing

TNL-4566: Lint Mako templates outside of expressions

Exclude deleted files from safe template linting

SOL-1776 Added Studio settings image upload acceptance tests

clear request cache after celery task finishes (TNL-2705)

SOL-1811

- Lint directories and files in sorted order.
- Lint python blocks in Mako.

TNL-4590

Christina/tnl 1619 xss

TNL-4540

Use the correct JWT key when authenticating against the course catalog API.

Can no longer play outside of the start/end time for the clip.

set max_num_courses_in_cache on modulestore

Detail Logging xmodule exceptions

Aj/sust 24 globalstaff course access

Add bokchoy test and changes in html

Corrects duplicate main element wrapper on Wiki article template

Updates and corrects href links to readthedocs

Merge release to master for 2016-05-17 release

AC-405 calculator image to icon

AC-399 adding alt for circuit schematic controls

AC-396 updating courseware nav to display correctly on high contrast displays

User administration updates