Implemented RPC framework

ethereum.go

@@ -4,6 +4,7 @@ import (
 	"container/list"
 	"github.com/ethereum/eth-go/ethchain"
 	"github.com/ethereum/eth-go/ethdb"
+	"github.com/ethereum/eth-go/etherpc"
 	"github.com/ethereum/eth-go/ethutil"
 	"github.com/ethereum/eth-go/ethwire"
 	"io/ioutil"
@@ -62,6 +63,8 @@ type Ethereum struct {
 	MaxPeers int
 
 	reactor *ethutil.ReactorEngine
+
+	RpcServer *etherpc.JsonRpcServer
 }
 
 func New(caps Caps, usePnp bool) (*Ethereum, error) {
@@ -338,6 +341,7 @@ func (s *Ethereum) Stop() {
 
 	s.txPool.Stop()
 	s.stateManager.Stop()
+	s.RpcServer.Stop()
 
 	close(s.shutdownChan)
 }