Make catch_stream.hpp a standard .cpp file

include/internal/catch_impl.hpp

@@ -29,7 +29,6 @@
 
 
 #include "../catch_session.hpp"
-#include "catch_stream.hpp"
 #include "catch_test_spec.hpp"
 #include "catch_test_case_tracker.hpp"
 

include/internal/catch_stream.cpp

@@ -6,8 +6,6 @@
  *  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  *
  */
-#ifndef TWOBLUECUBES_CATCH_STREAM_HPP_INCLUDED
-#define TWOBLUECUBES_CATCH_STREAM_HPP_INCLUDED
 
 #include "catch_common.h"
 #include "catch_enforce.h"
@@ -106,5 +104,3 @@ namespace Catch {
     }
 #endif
 }
-
-#endif // TWOBLUECUBES_CATCH_STREAM_HPP_INCLUDED