Upgrade `requests` module to 2.3.0
Upgrade `requests-oauthlib` to 0.4.1
Upgrade `oauthlib` to 0.6.3
Add argument.
Add scope/field selector settings for LinkedIn provider.

This change adds three new configuration variables to third_party_auth's LinkedIn provider:

* SOCIAL_AUTH_LINKEDIN_OAUTH2_SCOPE,
* SOCIAL_AUTH_LINKEDIN_OAUTH2_FIELD_SELECTORS,
* SOCIAL_AUTH_LINKEDIN_OAUTH2_EXTRA_DATA

Being able to configure these additional settings is useful if you want
the LinkedIn provider to pre-populate the email field when a new user
registers via the linkedin provider.

The Google provider prepoulates the email field by default, but if you
want LinkedIn to do the same, these two settings should be set to:

SOCIAL_AUTH_LINKEDIN_OAUTH2_SCOPE = ['r_basicprofile', 'r_emailaddress']
SOCIAL_AUTH_LINKEDIN_OAUTH2_FIELD_SELECTORS = ['email-address']

For more info see:
http://psa.matiasaguirre.net/docs/backends/linkedin.html
Added mising tinymce.js to static_htmlbook.html.

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

LMS-2848
Add redirect.
Add url redirect to.
Update error code.
Fix unit test.
Move js import into courseware js group.
Use confirm dialogue.
Merge pull request #4190 from edx/usman/lms2848-htmlbooks-fix

Fix for htmlbooks
Prevents students from accidentally changing their enrollment on login (LMS-2773)

skip tests if not run in lms
Fix unit test.
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.