Document https redirection setting for authentication.
Make profile fields from the ID token optional.
Set user language from ID token locale value.
Merge pull request #123 from rocha/set-user-language

Set user language from ID token locale value
changing variant name to match config role
Merge pull request #124 from edx/e0d/fix-logging

changing variant name to match config role
Merge pull request #118 from rocha/add-https-setting

Document https redirection setting for authentication.