Allows for setting a patch message during a push. Eg.:
$ git push -o patch.message="My Title" -o patch.message="My description" \
rad HEAD:refs/patches
Works the same way as the `-m` flag of `git commit`.
This adds the ability to the git-remote-helper to open and update
patches via a `git push` to the magic ref `refs/patches` and
`refs/heads/patches/<patch-id>`.
The main change is that we had to move away from offering the `connect`
capability in the remote helper, to offering `push` and `fetch`
individually.
To get a feel for how this works, see the `rad-patch-via-push.md`
example.
Alexis Sellier
xphoniex