removed STL usage of Extras/ConvexBuilder and replaced by btAlignedObjectArray

fixed several warnings, thanks to sparkprime
added comments patch for linear math, thanks to Tully Foote

src/BulletDynamics/Dynamics/btDiscreteDynamicsWorld.h

@@ -152,6 +152,7 @@ public:
 
 	virtual void	setNumTasks(int numTasks)
 	{
+        (void) numTasks;
 	}
 
 };