cmd/geth, jsre, rpc: run all JS code on the event loop

Some JSRE methods (PrettyPrint, ToVal) bypassed the event loop. All
calls to the JS VM are now wrapped. In order to make this somewhat more
foolproof, the otto VM is now a local variable inside the event loop.

rpc/jeth.go

@@ -3,18 +3,18 @@ package rpc
 import (
 	"encoding/json"
 	"fmt"
+
 	"github.com/ethereum/go-ethereum/jsre"
 	"github.com/robertkrimen/otto"
 )
 
 type Jeth struct {
 	ethApi *EthereumApi
-	toVal  func(interface{}) otto.Value
 	re     *jsre.JSRE
 }
 
-func NewJeth(ethApi *EthereumApi, toVal func(interface{}) otto.Value, re *jsre.JSRE) *Jeth {
-	return &Jeth{ethApi, toVal, re}
+func NewJeth(ethApi *EthereumApi, re *jsre.JSRE) *Jeth {
+	return &Jeth{ethApi, re}
 }
 
 func (self *Jeth) err(call otto.FunctionCall, code int, msg string, id interface{}) (response otto.Value) {