im: add bubble for unread message

Also set all read when on im page or when displaying it

Change-Id: I71fde714cdd4888e483e724fd3757a5adf540fb0
Tuleap: #232
diff --git a/callwidget.cpp b/callwidget.cpp
index 7bc345c..08bb4bf 100644
--- a/callwidget.cpp
+++ b/callwidget.cpp
@@ -609,6 +609,7 @@
                                 this,
                                 SLOT(slotAccountMessageReceived(QMap<QString,QString>,ContactMethod*,Media::Media::Direction)));
         ui->listMessageView->scrollToBottom();
+        txtRecording->setAllRead();
     }
 }
 
@@ -618,10 +619,10 @@
                                        Media::Media::Direction dir)
 {
     Q_UNUSED(message)
-    Q_UNUSED(cm)
     Q_UNUSED(dir)
 
     ui->listMessageView->scrollToBottom();
+    cm->textRecording()->setAllRead();
 }
 
 void