Add support for deploying to more than one host for rsync, sftp and ftp

I recently needed to deploy to a load-balanced multi-node setup and had to adapt the code to make this work. Since we don't have any access to FTP or SFTP, I adapted these methods to, but could not test it, though the changes are pretty straight-forward. Maybe someone should do a quick test for that, too.

RSync works, I already deployed something.