Added experimental implicit gyroscopic force implementation, one by Michael Ewert, and another by Cooper (from OpenDE)

Will also add Erin Catto's local implicit version from the GDC 2015 tutorial
Added demo for btGeneric6DofSpring2Constraint, thanks to Gabor Puhr
Add gfxBridge.autogenerateGraphicsObjects method for Bullet 2 demos in new framework (need to implement all Bullet 2 collision shape types...)
Use 1,1,1 for local scaling in btStaticPlaneShape

Demos3/bullet2/MultiBodyDemo/MultiBodyVehicle.cpp

@@ -215,18 +215,16 @@ void MultiBodyVehicleSetup::initPhysics(GraphicsPhysicsBridge& gfxBridge)
         btBoxShape* box = new btBoxShape(groundHalfExtents);
         box->initializePolyhedralFeatures();
         
-        gfxBridge.createCollisionShapeGraphicsObject(box);
+        
         btTransform start; start.setIdentity();
         btVector3 groundOrigin(0,0,0);
         groundOrigin[upAxis]=-1.5;
         start.setOrigin(groundOrigin);
         btRigidBody* body =  createRigidBody(0,start,box);
-        btVector4 color = colors[curColor];
-        curColor++;
-        curColor&=3;
-        gfxBridge.createRigidBodyGraphicsObject(body,color);
+        
     }
 
+	gfxBridge.autogenerateGraphicsObjects(m_dynamicsWorld);
 }
 
 void MultiBodyVehicleSetup::stepSimulation(float deltaTime)