Added ConcaveRaycastDemo, thanks to John Rowe (JMC) for the contribution!

Demos/ConcaveRaycastDemo/main.cpp

@@ -0,0 +1,15 @@
+
+#include "ConcaveRaycastDemo.h"
+#include "GlutStuff.h"
+
+
+int main(int argc,char** argv)
+{
+
+        ConcaveRaycastDemo* concaveRaycastDemo = new ConcaveRaycastDemo();
+        concaveRaycastDemo->initPhysics();
+        concaveRaycastDemo->setCameraDistance(30.f);
+
+        return glutmain(argc, argv,640,480,"Concave Raycast Demo",concaveRaycastDemo);
+}
+