Only consider connected after connecting

Prior to this change IsConnected would return true for any state higher
than disconnected, this meant that we would return true while connecting
when it might not be possible at all to connect to any of the servers.

resolves #243

client.go

@@ -163,7 +163,7 @@ func (c *client) IsConnected() bool {
 	switch {
 	case status == connected:
 		return true
-	case c.options.AutoReconnect && status > disconnected:
+	case c.options.AutoReconnect && status > connecting:
 		return true
 	default:
 		return false