Fix typo in grammar.

Add lexertl.

inc/lexertl/is_same.hpp

@@ -0,0 +1,29 @@
+// is_same.hpp
+// Copyright (c) 2010-2012 Ben Hanson (http://www.benhanson.net/)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file licence_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef LEXERTL_IS_SAME_HPP
+#define LEXERTL_IS_SAME_HPP
+
+namespace lexertl
+{
+namespace detail
+{
+template<typename t1, typename t2>
+struct is_same
+{
+    enum {same = false};
+};
+
+template<typename t1>
+struct is_same<t1, t1>
+{
+    enum {same = true};
+};
+}
+}
+
+#endif
+