added marker for send/receive state check

chatState.go

 	Name   string   `json:"Name"`   //state name
 	Expire int32    `json:"Expire"` //unix timestamp  when this state expire
 	Send   struct { //anything we need to send?
+		Sent    bool              `json:"Sent"`    //whether the message has been sent or not
 		Type    string            `json:"Type"`    //what type of message
 		Message map[string]string `json:"Message"` //the message to be sent,key value pair to describe the message
 	} `json:"Send"`
 
 	Receive struct { //anything we expect to receive
+		Received  bool              `json:"Received"` //whether the expected message has been received or not
 		Validator string            `json:"Validator"`
 		Hint      string            `json:"Hint"`
 		Message   map[string]string `json:"Message"` //the description for receiving message

chatState_test.go

 		"txt":  "What is your date of birth?",
 		"icon": "/mnt/data/abc.jpg"}
 	s.Send.Type = "text"
+	s.Send.Sent = false
 	s.Receive.Hint = "hint"
+	s.Receive.Received = false
 	s.Receive.Validator = "validator email"
 	s.Receive.Message = map[string]string{
 		"rtxt":  "should be 3 chars at least",
 	AssertEqual(t, m.Name, n.Name, "Name should be equal")
 	AssertEqual(t, m.Expire, n.Expire, "Expire should be equal")
 	AssertEqual(t, m.Send.Type, n.Send.Type, "Send.Type should be equal")
+	AssertEqual(t, m.Receive.Received, false, "Receive.Received should be false")
+	AssertEqual(t, m.Send.Sent, false, "Send.Sent should be false")
 	AssertEqual(t, m.Send.Message["txt"], n.Send.Message["txt"], "Message[txt] should be equal")
 	AssertEqual(t, m.Send.Message["icon"], n.Send.Message["icon"], "Message[icon] should be equal")
 	AssertEqual(t, m.Receive.Message["rtxt"], n.Receive.Message["rtxt"], "Message[rtxt] should be equal")