The patch file for an individual commit is now fetchable by sending the

Accept: text/x-patch header to the DiffCommitResource and

DraftDiffCommitResource. This patch is composed of the individual

patches for all FileDiffs in the DiffCommit.

Ran unit tests.
Uploaded a review request with commit history and made an HTTP request

to the DiffCommitResource API endpoint with a Accept: text/x-patch

header. The returned response was a patch file that contained only the

diff information for FileDiffs in that commit.