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/vland.py b/vland.py
index 9233cb9..335dbe5 100755
--- a/vland.py
+++ b/vland.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
@@ -38,7 +38,7 @@
     """ Simple container for stuff to make for nicer syntax """
 
 state = DaemonState()
-state.version = "0.4-DEV"
+state.version = "0.4"
 state.banner = "Linaro VLANd version %s" % state.version
 state.starttime = time.time()
 state.vis = None