Upgrade `requests` module to 2.3.0
Upgrade `requests-oauthlib` to 0.4.1
Upgrade `oauthlib` to 0.6.3
Add argument.
log stop_video event
The LMS should serve favicon.ico also when a theme is enabled.
Added mising tinymce.js to static_htmlbook.html.

LMS-2848
Pass storage_url and token values as parameters to StudentNotes init.

LMS-2848
Merge pull request #4190 from edx/usman/lms2848-htmlbooks-fix

Fix for htmlbooks
Lower logging level in grading condition from exception to info

addresses part of LMS-2907
Merge pull request #4192 from edx/adam/change-logging-level-gradding

Lower logging level in grading condition from exception to info
Redirect Chinese students to a Chinese CDN for video.
Remove pirate and lolcat translation files to prevent accidental display
Merge pull request #4197 from edx/sarina/remove-en@-translations

Remove pirate and lolcat translation files to prevent accidental display
Merge pull request #4196 from edx/oleg/video-caching

Redirect Chinese students to a Chinese CDN for video.
Merge pull request #3769 from shindere/favicon-fixup

Improves the way LMS serves /favicon.ico
Move video descriptor instantiation in tests to single place.
Merge pull request #4086 from edx/alex/refactor_video_test_2

Move video descriptor instantiation in tests to single place.
Remove unused code when download from youtube.
Deprecating acceptance_tests from rake to paver