added InternalEdgeDemo and fixes for btInternalEdgeUtility

Demos/InternalEdgeDemo/main.cpp

@@ -0,0 +1,19 @@
+
+#include "InternalEdgeDemo.h"
+#include "GlutStuff.h"
+
+#include "GLDebugDrawer.h"
+#include "btBulletDynamicsCommon.h"
+
+
+int main(int argc,char** argv)
+{
+
+        InternalEdgeDemo* internalEdgeDemo = new InternalEdgeDemo();
+        internalEdgeDemo->initPhysics();
+        internalEdgeDemo->setCameraDistance(30.f);
+
+
+        return glutmain(argc, argv,640,480,"Internal Edge Demo",internalEdgeDemo);
+}
+