GitHub Two Factor Authentication
I have added support for GitHub's two factor authentication when authorizing accounts, I have not yet looked at account revocation.
This has only been tested with my personal GitHub account.
Reviewers: mwolff, kfunk, ial0
Reviewed By: kfunk
Subscribers: mwolff, kfunk, kdevelop-devel
Differential Revision: https://phabricator.kde.org/D2621