Add copyright information to .py files

This change adds explicit copyright information too python
files files.  The copyright year used in each case is the
date of the first git commit of each file.

The goal is to allow jsoncpp to be integrated into the
chromium source tree which requires license information in
each source file.

fixes #234

test/cleantests.py

@@ -1,4 +1,10 @@
-# removes all files created during testing
+# Copyright 2007 Baptiste Lepilleur
+# Distributed under MIT license, or public domain if desired and
+# recognized in your jurisdiction.
+# See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE
+
+"""Removes all files created during testing."""
+
 import glob
 import os
 

test/generate_expected.py

@@ -1,3 +1,8 @@
+# Copyright 2007 Baptiste Lepilleur
+# Distributed under MIT license, or public domain if desired and
+# recognized in your jurisdiction.
+# See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE
+
 from __future__ import print_function
 import glob
 import os.path

test/pyjsontestrunner.py

@@ -1,4 +1,11 @@
-# Simple implementation of a json test runner to run the test against json-py.
+# Copyright 2007 Baptiste Lepilleur
+# Distributed under MIT license, or public domain if desired and
+# recognized in your jurisdiction.
+# See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE
+
+"""Simple implementation of a json test runner to run the test against
+json-py."""
+
 from __future__ import print_function
 import sys
 import os.path

test/runjsontests.py

@@ -1,3 +1,8 @@
+# Copyright 2007 Baptiste Lepilleur
+# Distributed under MIT license, or public domain if desired and
+# recognized in your jurisdiction.
+# See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE
+
 from __future__ import print_function
 from __future__ import unicode_literals
 from io import open

test/rununittests.py

@@ -1,3 +1,8 @@
+# Copyright 2009 Baptiste Lepilleur
+# Distributed under MIT license, or public domain if desired and
+# recognized in your jurisdiction.
+# See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE
+
 from __future__ import print_function
 from __future__ import unicode_literals
 from io import open