Support Client Credential grant
Add support for OAuth client credential grant.
Not until https://github.com/scribejava/scribejava/pull/794 is merged and https://github.com/scribejava/scribejava/issues/793 closed.
Add support for OAuth client credential grant.
Not until https://github.com/scribejava/scribejava/pull/794 is merged and https://github.com/scribejava/scribejava/issues/793 closed.