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
Add redirect.
Add url redirect to.
Update error code.
Fix unit test.
Move js import into courseware js group.
Use confirm dialogue.
Explicitly skip tests in common unless we know we're running the LMS unittest suite
Prevents students from accidentally changing their enrollment on login (LMS-2773)

skip tests if not run in lms
Fix unit test.
Initial draft moving key creation out of wiki
Remove unused code when download from youtube.
Merge pull request #4026 from edx/db/requests-2

Upgrade `requests` module
Update the discussion area broken span tags
FOR-578
Add test that xml body was parsed successfully.
Merge pull request #4105 from edx/alex/remove_unused_code_when_downloading_from_youtube

Remove unused code when download from youtube.