ui: make photo round

Change-Id: I5738d1a435b0587ad1b1a9d0639ba7ea8f83bedf
Tuleap: #148
diff --git a/windowscontactbackend.h b/windowscontactbackend.h
index 4d0f7c3..da80eca 100644
--- a/windowscontactbackend.h
+++ b/windowscontactbackend.h
@@ -55,6 +55,7 @@
 
 private:
     bool getPersonFromContactFile(const QDir &contactDir, const QString& contactFileName);
+    QImage getCirclePhoto(const QImage original);
 };
 
 class WindowsContactEditor : public CollectionEditor<Person>