Chaining objects example (r28)

This is a cool little example based on a bug report someone submitted (sorry, forgotten who ) that demonstrates instance indexing in r28.

Using instance indexing, it's really easy to get the previous-instance-in-chain's X and Y co-ordinates and make this effect. In 0.x, this would have been incredibly hard to do!

Exactly what i was trying to do on release 27

Thanks !