Fix debian specification version and copyright

Change debian specification version to 3.9.4 and fix some typos in
debian/copyright file

debian/control

@@ -4,7 +4,7 @@ Priority: extra
 Maintainer: Nikos Skalkotos <skalkoto@grnet.gr>
 Build-Depends: debhelper (>= 7.0.50~), automake, autotools-dev, kpartx,
  qemu-utils, mbr, curl, xmlstarlet, parted, libhivex-bin
-Standards-Version: 3.9.1
+Standards-Version: 3.9.4
 Homepage: https://code.grnet.gr/projects/snf-image
 Vcs-Git: git://code.grnet.gr/git/snf-image
 Vcs-Browser: https://code.grnet.gr/git/snf-image

debian/copyright

@@ -4,15 +4,15 @@ Upstream-Contact: Nikos Skalkotos <skalkoto@grnet.gr>
 Source: https://code.grnet.gr/projects/snf-image
 
 Files: *
-Copyright: Copyright (C) 2011, 2012, 2013 Greek Research and Technology Network
-Licence: GPL-2
+Copyright: Copyright (C) 2011-2014 Greek Research and Technology Network
+License: GPL-2
 
 Files: snf-image-host/common.sh.in
-Copyright: Copyright (C) 2011, 2012, 2013 Greek Research and Technology Network
+Copyright: Copyright (C) 2011-2014 Greek Research and Technology Network
            Copyright (C) 2007, 2008, 2009 Google Inc.
-Licence: GPL-2
+License: GPL-2
 
-Licence: GPL-2
+License: GPL-2
  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
  the Free Software Foundation; either version 2 of the License, or