+ bugfix in btAlignedObjectArray, not calling destructors on resize to smaller array.

Thanks Benoit for pointing this out, and bugfix: http://code.google.com/p/bullet/issues/detail?id=218

+ Added point to point, hinge, slider and generic 6dof constraints to Maya Dynamica plugin
Thanks to Herbert Law for the constribution: http://code.google.com/p/bullet/issues/detail?id=221

src/LinearMath/btAlignedObjectArray.h

@@ -171,9 +171,9 @@ class btAlignedObjectArray
 		{
 			int curSize = size();
 
-			if (newsize < size())
+			if (newsize < curSize)
 			{
-				for(int i = curSize; i < newsize; i++)
+				for(int i = newsize; i < curSize; i++)
 				{
 					m_data[i].~T();
 				}