Comment 2 for bug 1580167

This would be possible, though on the whole we'd prefer to avoid getting series involved in git hosting. It's a lot of complexity that mostly isn't needed, and it brings its own problems: for example, git branches are more freely deletable than bzr branches are (it's just a "git push --delete" rather than a webapp operation) and so it would raise questions such as what happens if the nominated branch for a series is deleted. Best to avoid that if we don't need it.