* #40232: Add zrtp module in SipCall

SipCall keeps track of its security state, and store its SAS if needed.
This commit also introduce two new Fragments wrappers, for accounts and calls.
These wrappers reduce code duplication between fragments requiring hooks on daemon
signals.
diff --git a/src/org/sflphone/fragments/TransferDFragment.java b/src/org/sflphone/fragments/TransferDFragment.java
index ff925f8..6c8bee9 100644
--- a/src/org/sflphone/fragments/TransferDFragment.java
+++ b/src/org/sflphone/fragments/TransferDFragment.java
@@ -35,6 +35,8 @@
 import java.util.ArrayList;
 import java.util.List;
 
+import android.app.Dialog;
+import android.support.v4.app.DialogFragment;
 import org.sflphone.R;
 import org.sflphone.loaders.ContactsLoader;
 import org.sflphone.model.Conference;
@@ -42,8 +44,6 @@
 
 import android.app.Activity;
 import android.app.AlertDialog;
-import android.app.Dialog;
-import android.app.DialogFragment;
 import android.app.LoaderManager;
 import android.content.Context;
 import android.content.DialogInterface;