Add copyright notices.

[SVN r34726]

example/tutorial/timer3/timer.cpp

@@ -1,3 +1,13 @@
+//
+// timer.cpp
+// ~~~~~~~~~
+//
+// Copyright (c) 2003-2006 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
 #include <iostream>
 #include <boost/asio.hpp>
 #include <boost/bind.hpp>