Add license headers to the files in python/examples

at least to the ones that are copyright by Swiss Library for the blind.

The files are all licensed under GNU All-Permissive
License (http://www.gnu.org/licenses/license-list.html#GNUAllPermissive)

Related to #22

python/examples/dtbook2brldtbook.xsl

@@ -1,5 +1,14 @@
 <?xml version='1.0'?>
 
+<!-- liblouis Braille Translation and Back-Translation Library -->
+
+<!-- Copyright (C) 2010 Swiss Library for the Blind, Visually Impaired and Print Disabled -->
+
+<!-- Copying and distribution of this file, with or without modification, -->
+<!-- are permitted in any medium without royalty provided the copyright -->
+<!-- notice and this notice are preserved. This file is offered as-is, -->
+<!-- without any warranty. -->
+
 <xsl:stylesheet 
    version='1.0'
    xmlns:xsl='http://www.w3.org/1999/XSL/Transform'

python/examples/liblouisxslt.py

@@ -1,5 +1,14 @@
 #! /usr/bin/python -u
 #
+# liblouis Braille Translation and Back-Translation Library
+
+# Copyright (C) 2010 Swiss Library for the Blind, Visually Impaired and Print Disabled
+
+# Copying and distribution of this file, with or without modification,
+# are permitted in any medium without royalty provided the copyright
+# notice and this notice are preserved. This file is offered as-is,
+# without any warranty.
+
 # This is a very simple example on how to extend libxslt to be able to
 # invoke liblouis from xslt. See also the accompanying
 # dtbook2brldtbook.xsl in the same directory which simpy copies a dtbook