add wavefront loader

start adding various scenes to test gpu rigid body pipeline
reserve more memory for shapes (concave triangle mesh can be huge) in GLInstancingRenderer
fix a few crashes when 0 objects

demo/gpudemo/rigidbody/ConcaveScene.h

@@ -0,0 +1,27 @@
+#ifndef CONCAVE_SCENE_H
+#define CONCAVE_SCENE_H
+
+#include "GpuRigidBodyDemo.h"
+
+class ConcaveScene : public GpuRigidBodyDemo
+{
+public:
+
+	ConcaveScene(){}
+	virtual ~ConcaveScene(){}
+	virtual const char* getName()
+	{
+		return "GRBConcave";
+	}
+
+	static GpuDemo* MyCreateFunc()
+	{
+		GpuDemo* demo = new ConcaveScene;
+		return demo;
+	}
+
+	virtual void setupScene(const ConstructionInfo& ci);
+
+};
+
+#endif //CONCAVE_SCENE_H