Change ChatroomInfo to contain more information

Change-Id: Ie91ced5dd9be51c8d59a0c5d881967658a58fd15
diff --git a/src/chatroom-discovery-dialog.cpp b/src/chatroom-discovery-dialog.cpp
index 327e4e7..738eb84 100644
--- a/src/chatroom-discovery-dialog.cpp
+++ b/src/chatroom-discovery-dialog.cpp
@@ -3,7 +3,6 @@
 
 namespace chronos {
 
-using std::vector;
 using ndn::Name;
 
 ChatroomDiscoveryDialog::ChatroomDiscoveryDialog(QWidget* parent)
@@ -67,7 +66,7 @@
 
     QString content;
 
-    for (vector<Name>::const_iterator nameIt = it->second.getParticipants().begin();
+    for (std::list<Name>::const_iterator nameIt = it->second.getParticipants().begin();
          nameIt != it->second.getParticipants().end(); nameIt++) {
       content.append(QString::fromStdString(nameIt->toUri())).append(",");
     }