added btGetVersion(), return integer without the fraction: for example 2.64 returns 264.

moved more demos into AllBulletDemos

Demos/ConstraintDemo/main.cpp

@@ -0,0 +1,15 @@
+#include "ConstraintDemo.h"
+#include "GlutStuff.h"
+
+int main(int argc,char** argv)
+{
+
+        ConstraintDemo* constraintDemo = new ConstraintDemo();
+
+        constraintDemo->initPhysics();
+
+        constraintDemo->setCameraDistance(26.f);
+
+        return glutmain(argc, argv,640,480,"Constraint Demo. http://www.continuousphysics.com/Bullet/phpBB2/",constraintDemo);
+}
+