Email addresses are exposed on the redirection links to the inbox

[kgashok]

The project has been using OAuth Version 1.0.

By moving to OAuth Version 2.0, we can get additional information including userid or nickname or displayname and use that instead of email address in the redirection links to the inbox.

[kgashok]

Issue still not resolved fully.

[KTibow]

This is important, I have a personal and public email, it'd be at least nice to choose between which email addresses that saythanks got when I registered with GitHub.