Add client_version RPC message

xeth/xeth.go

@@ -36,6 +36,7 @@ type Backend interface {
 	EventMux() *event.TypeMux
 	Whisper() *whisper.Whisper
 	Miner() *miner.Miner
+	ClientVersion() string
 }
 
 type XEth struct {
@@ -164,6 +165,10 @@ func (self *XEth) IsContract(address string) bool {
 	return len(self.State().SafeGet(address).Code()) > 0
 }
 
+func (self *XEth) GetClientVersion() string {
+	return self.eth.ClientVersion()
+}
+
 func (self *XEth) SecretToAddress(key string) string {
 	pair, err := crypto.NewKeyPairFromSec(fromHex(key))
 	if err != nil {