Automatic push

[csmith]

An option to automatically push the git repository to a remote

[csmith]

I think this makes sense as a flag, rather than a config setting.

On creation the git repo would populate a new remote with the URL if it isn't already correctly defined. On any write operation we'd then push if the remote is configured.

Would need to also pass in a path to an SSH key and an optional password. I don't think it's worth bothering with non-SSH auth methods yet.