Added name fields to Collision Object and Shape.

Added name field to Typed Constraint.
Added accessor for gravity in dynamics world.

src/BulletCollision/CollisionDispatch/btCollisionObject.cpp

@@ -26,6 +26,7 @@ btCollisionObject::btCollisionObject()
 		m_deactivationTime(btScalar(0.)),
 		m_friction(btScalar(0.5)),
 		m_restitution(btScalar(0.)),
+		m_objectName (0),
 		m_userObjectPointer(0),
 		m_internalOwner(0),
 		m_hitFraction(btScalar(1.)),

src/BulletCollision/CollisionDispatch/btCollisionObject.h

@@ -69,6 +69,9 @@ protected:
 	///m_internalOwner is reserved to point to Bullet's btRigidBody. Don't use this, use m_userObjectPointer instead.
 	void*			m_internalOwner;
 
+	// setName, getName
+	char*                   m_objectName;
+
 	///time of impact calculation
 	btScalar		m_hitFraction; 
 	
@@ -334,6 +337,18 @@ public:
 		m_userObjectPointer = userPointer;
 	}
 
+	char* getName () const
+	{
+		return m_objectName;
+	}
+
+
+        /// the user is responsible for the memory management of name
+	void setName (char* name)
+	{
+		m_objectName = name;
+	}
+
 	inline bool checkCollideWith(btCollisionObject* co)
 	{
 		if (m_checkCollideWith)

src/BulletCollision/CollisionShapes/btCollisionShape.h

@@ -27,10 +27,11 @@ class btCollisionShape
 {
 
 	void* m_userPointer;
+	char* m_shapeName;
 
 public:
 
-	btCollisionShape() : m_userPointer(0)
+	btCollisionShape() : m_userPointer(0), m_shapeName (0)
 	{
 	}
 	virtual ~btCollisionShape()
@@ -103,7 +104,16 @@ public:
 		return m_userPointer;
 	}
 
+	char* getShapeName () const
+	{
+		return m_shapeName;
+	}
 
+	/// the user is responsible for the memory management of name
+	void setShapeName (char* name)
+	{
+		m_shapeName = name;
+	}
 };	
 
 #endif //COLLISION_SHAPE_H