Preparing the v0.4 release

Update version strings
Update the Changelog and README
Update copyright year in various files

Change-Id: If746211e0b36e59d4f3de977b81df082f2da9fe3
diff --git a/drivers/TPLinkTLSG2XXX.py b/drivers/TPLinkTLSG2XXX.py
index 7402c59..2b6048a 100644
--- a/drivers/TPLinkTLSG2XXX.py
+++ b/drivers/TPLinkTLSG2XXX.py
@@ -1,6 +1,6 @@
 #! /usr/bin/python
 
-#  Copyright 2014 Linaro Limited
+#  Copyright 2014-2015 Linaro Limited
 #
 #  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