Adding go.{mod,sum} (#4) Adding go module support, relates to #3.

add support for ssl options (#2) * add support for ssl options * use strconv.ParseBool * set clusterConfig.SslOpts in each case instead * expand on tests * fix extraneous TrimSpace and missing QueryUnescape on value * reorg tests for TestConfigStringToClusterConfig * only QueryUnescape username, password, certPath, keyPath, and caPath * add SslOptions to ClusterConfigToConfigString * fix missing QueryEscape on username and password