Java Edition 12w15a

12w15a is the first snapshot released for 1.3.1.

Changes

 * Stackable items now stack outside inventory when thrown to the ground individually.
 * "Pick Block" button now gives the correct block when used; when clicking on a mob, it gives the appropriate spawn egg.
 * +clicking can now be used to wear armor.
 * Brewing Stands and Enchantment Tables allow use of shift clicking to put items in it.
 * Dispensers will deploy boats on water, and minecarts on rails. Powered minecarts and storage minecarts are also deployed similar to minecarts.
 * Right clicking a powered minecart in Creative Mode will act as if you would give it coal.
 * Decreased slime spawning rate in superflat worlds