Those are only on Gavin's local repository.

The path is "gavinandresen/bitcoinxt" and it is forked from "bitcoinxt/bitcoinxt" (see the top of the page)

If Gavin wants those changes added to Bitcoin XT, he needs to submit a pull request.  The maintainer of Bitcoin XT (Mike) can then merge the changes into the master branch.  Alternatively, he could say that he wants some changes.  They are probably discussing what is required so when a PR is submitted, it will mostly comply with the requirements.