Get Signature Verification When Viewing Git Data Commit

[shiftkey]

API documentation: https://developer.github.com/v3/git/commits/#commit-signature-verification

An enhancement as part of the Commit Signing API is to surface the signature details in the commit.

It looks like these are the new properties:

    "verification": {
      "verified": true,
      "reason": "valid",
      "signature": "-----BEGIN PGP MESSAGE-----\n...\n-----END PGP MESSAGE-----",
      "payload": "tree 6dcb09b5b57875f334f61aebed695e2e4193db5e\n..."
    }

These fields should be available on the Commit response object (perhaps in a class called Verification or something), and the CommitsClient.Get action should be updated to use the new Accepts header:

application/vnd.github.cryptographer-preview+sha

I'd also like to see a new integration test added to verify this behaviour is working as expected.

Questions

We use Commit in many places, so I hope that this doesn't affect other places where we deserialize the payload...

[Sarmad93]

@shiftkey i want to grab this one 😃