Refactored a lot of code from headers into impl headers only compiled into one TU

- also added noimpl option to single header script - which only generates the non impl code

include/internal/catch_stream.h

@@ -0,0 +1,33 @@
+/*
+ *  Created by Phil on 2/12/2013.
+ *  Copyright 2013 Two Blue Cubes Ltd. All rights reserved.
+ *
+ *  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 TWOBLUECUBES_CATCH_STREAM_H_INCLUDED
+#define TWOBLUECUBES_CATCH_STREAM_H_INCLUDED
+
+#include <streambuf>
+
+#ifdef __clang__
+#pragma clang diagnostic ignored "-Wpadded"
+#endif
+
+namespace Catch {
+
+    class Stream {
+    public:
+        Stream();
+        Stream( std::streambuf* _streamBuf, bool _isOwned );
+        void release();
+
+        std::streambuf* streamBuf;
+
+    private:
+        bool isOwned;
+    };
+}
+
+#endif // TWOBLUECUBES_CATCH_STREAM_H_INCLUDED