defer add listenners, add options.refork, optional unexpectedExit event

```
> setImmediate
ReferenceError: setImmediate is not defined
    at repl:1:2
    at REPLServer.self.eval (repl.js:109:21)
    at Interface.<anonymous> (repl.js:248:12)
    at Interface.EventEmitter.emit (events.js:96:17)
    at Interface._onLine (readline.js:200:10)
    at Interface._line (readline.js:518:8)
    at Interface._ttyWrite (readline.js:736:14)
    at ReadStream.onkeypress (readline.js:97:10)
    at ReadStream.EventEmitter.emit (events.js:126:20)
    at emitKey (readline.js:1058:12)
```