account/text message : add conversation model

- adds conversation class and conversationMessage class.

- adds to each contact a conversation member wich will store the messages history.

Change-Id: Icdab0e2345ef2889057c06d965ff0eb2940c5a27
Tuleap: #943
diff --git a/Contact.cpp b/Contact.cpp
index 2377b9c..703e293 100644
--- a/Contact.cpp
+++ b/Contact.cpp
@@ -1,6 +1,7 @@
 /**************************************************************************

 * Copyright (C) 2016 by Savoir-faire Linux                                *

 * Author: Jäger Nicolas <nicolas.jager@savoirfairelinux.com>              *

+* Author: Traczyk Andreas <traczyk.andreas@savoirfairelinux.com>          *

 *                                                                         *

 * This program is free software; you can redistribute it and/or modify    *

 * it under the terms of the GNU General Public License as published by    *

@@ -30,6 +31,7 @@
 {

     name_ = name;

     ringID_ = ringID;

+    conversation_ = ref new Conversation();

 }

 

 void