Initial implementation of exclusive definition of compiler detection

with emulated definitions.

include/boost/predef/detail/comp_detected.h

@@ -0,0 +1,10 @@
+/*
+Copyright Rene Rivera 2014
+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_DETAIL_COMP_DETECTED
+#define BOOST_PREDEF_DETAIL_COMP_DETECTED 1
+#endif