Restructure the project to match new modular layout.

include/boost/predef/language.h

@@ -0,0 +1,15 @@
+/*
+Copyright Redshift Software Inc. 2011-2012
+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)
+*/
+
+#ifndef BOOST_PREDEF_LANGUAGE_H
+#define BOOST_PREDEF_LANGUAGE_H
+
+#include <boost/predef/language/stdc.h>
+#include <boost/predef/language/stdcpp.h>
+#include <boost/predef/language/objc.h>
+
+#endif