Change license to BSL. Added my copyright.

[SVN r31121]

v2/tools/msvc.jam

@@ -1,8 +1,10 @@
-# Copyright David Abrahams 2003. Permission to copy, use,
-# modify, sell and distribute this software is granted provided this
-# copyright notice appears in all copies. This software is provided
-# "as is" without express or implied warranty, and with no claim as
-# to its suitability for any purpose.
+# Copyright 2003 David Abrahams.
+# Copyright 2005 Vladimir Prus.
+#
+# Use, modification and distribution is subject to the Boost Software
+# License Version 1.0. (See accompanying file LICENSE_1_0.txt or
+# http://www.boost.org/LICENSE_1_0.txt)
+
 import property ;
 import generators ;
 import os ;