The 0.1.5. release of the Ruby client came out on December 8, 2014. (A link to this version will be posted soon; however, this version has since been superseded by Ruby 1.1.0, which was released on January 26, 2015 and is available for download here).
Ruby release 0.1.5 added Client.scan_node, Client.scan_all and Client.query. It fixed getting back results only for specified bin names.