[frogr] Mention code taken from tracker in README and header.

[Mario Sanchez Prada <msanchez src gnome org>]

commit e90db4faecaab4a2e6b37248f59429796330b3a6
Author: Mario Sanchez Prada <msanchez igalia com>
Date:   Thu Aug 18 03:30:50 2011 +0200

    Mention code taken from tracker in README and header.

 README                     |    4 ++++
 src/frogr-picture-loader.c |    4 ++++
 2 files changed, 8 insertions(+), 0 deletions(-)
---
diff --git a/README b/README
index 3cd9b9b..9ee996e 100644
--- a/README
+++ b/README
@@ -70,6 +70,10 @@ Some parts of the Frogr's Flickr API implementation (under
 src/flicksoup) based on source code from the libsoup library,
 licensed as LGPLv2 (Copyright 2008 Red Hat, Inc.)
 
+Implementation of the get_gps_coordinate () function inside of the
+FrogrPictureLoader taken from tracker, licensed under the GNU Lesser
+General Public License Version 2.1 (Copyright 2009, Nokia Corp.)
+
 The specific theme customizations for the MacOSX version of
 frogr through a gtkrc file were taken from the Banshee project
 (http://banshee.fm), written by Aaron Bockover <abockover novell com>
diff --git a/src/frogr-picture-loader.c b/src/frogr-picture-loader.c
index f2811df..94f12e8 100644
--- a/src/frogr-picture-loader.c
+++ b/src/frogr-picture-loader.c
@@ -4,6 +4,10 @@
  * Copyright (C) 2009-2011 Mario Sanchez Prada
  * Authors: Mario Sanchez Prada <msanchez igalia com>
  *
+ * Some parts of this file were based on source code from tracker,
+ * licensed under the GNU Lesser General Public License Version 2.1
+ * (Copyright 2009, Nokia Corp.)
+ *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of version 3 of the GNU General Public
  * License as published by the Free Software Foundation.