Update Leads

As it sits now whenever you tie a lead to any mob you can tie them to a fence, However when you want to to grab the Lead back again it breaks the Leads to the point you have to grab it and reattach it to the mob. 

Instead of going through that and depending on the situation any player could find them self in (like near an edge where the Lead could be lost or near lava). It would be a good little addition for a future update to simply add the ability to when you grab the Lead from a fence post that you simply grab the Lead and it stays attached to the mob for easy movement, and if you wish to release the mob then you grab it from the mob instead of the fence post.