Assorted cleanup of compilation warnings. Also fixed some actual errors:

#include "renderTexture.h"...when the file is actually called 'RenderTexture.h'.

Demos/Raytracer/Raytracer.cpp

@@ -46,7 +46,7 @@ Very basic raytracer, rendering into a texture.
 
 
 
-#include "renderTexture.h"
+#include "RenderTexture.h"
 
 btVoronoiSimplexSolver	simplexSolver;