Change to gravity mechanic on leads.

Currently it is possible to make a transport system using creatures like pigs suspended from a Minecart, however when the player rides one of these the lead stretches and breaks. There is a work around where you put the creature in a boat, suspend a boat and the player rides the creature. However this is just a lot less fun and cool than riding the pig directly.

I suggest that the lead only stretches according to the creature suspended, and a player riding the creature does not stretch it any more. This would allow me to make a merry-go-round with horses and pigs that appear to be running through the air while players ride them. The cool factor for this far outweighs the need for "realistic" mechanics.