Adding usage of git_create_remote_detached

[ralucas]

This creates a RemoteDetached type that is instantiable with a remote uri string. It has only one method, LsDetached for emulating git ls-remote <remote-uri>.

The reason for this is that it looks like there is no other way to simply do a git ls-remote type request without creating a repository reference locally.

Thank you for your time in reviewing this.