Add basic OpenID Connect setup

Provide ID token if requested on the authentication flow.
Add OpenID Connect UserInfo endpoint
Read claim handlers from Django settings
Remove username scope and fix form inheritance
Update requirements
Add instructor and staff scopes
Refactor tests
Updated to version 0.2.0
Update django-oauth2-provider required version
Merge pull request #10 from rocha/test

Update django-oauth2-provider required version
Fix django-oauth2-provider dependency link
Update to version 0.2.1
Fix requirements.txt file
Update version of django-oauth2-provider
Merge pull request #12 from rocha/update-provider

Update version of django-oauth2-provider.