Fixed whisper messages

* Whisper protocol wasn't properly suppling envelope slices
* Message history wasn't properly propagated
* Added 'Messages' method, filtering any current envelope with the
  supplied filter.

ui/qt/qwhisper/message.go

@@ -8,9 +8,9 @@ import (
 
 type Message struct {
 	ref     *whisper.Message
-	Flags   int32
-	Payload string
-	From    string
+	Flags   int32  `json:"flags"`
+	Payload string `json:"payload"`
+	From    string `json:"from"`
 }
 
 func ToQMessage(msg *whisper.Message) *Message {

ui/qt/qwhisper/whisper.go

@@ -43,7 +43,7 @@ func (self *Whisper) Post(payload []string, to, from string, topics []string, pr
 
 	msg := whisper.NewMessage(data)
 	envelope, err := msg.Seal(time.Duration(priority*100000), whisper.Opts{
-		Ttl:    time.Duration(ttl),
+		Ttl:    time.Duration(ttl) * time.Second,
 		To:     crypto.ToECDSAPub(fromHex(to)),
 		From:   crypto.ToECDSA(fromHex(from)),
 		Topics: whisper.TopicsFromString(topics...),
@@ -84,8 +84,14 @@ func (self *Whisper) Watch(opts map[string]interface{}, view *qml.Common) int {
 	return i
 }
 
-func (self *Whisper) Trigger(id int) {
-	go self.Whisper.Trigger(id)
+func (self *Whisper) Messages(id int) (messages *ethutil.List) {
+	msgs := self.Whisper.Messages(id)
+	messages = ethutil.EmptyList()
+	for _, message := range msgs {
+		messages.Append(ToQMessage(message))
+	}
+
+	return
 }
 
 func filterFromMap(opts map[string]interface{}) (f whisper.Filter) {