Java Edition 13w01a

13w01a is the first snapshot released for 1.5.

Additions

 * Added the Redstone Comparator
 * Has 2 inputs and 1 output
 * If A≥B, the output will be A, otherwise it will stay off – When the comparator is toggled, it will output full strength instead of A it will subtract B from A and need a comparator as input for B
 * Replacement for the capacitor
 * Whichever side gives the bigger signal will be considered signal B
 * Added the Daylight Sensor block
 * Added a Hopper block
 * Places and takes out items in Hoppers, Chests, Furnaces, Chest Minecart, Dispensers, and Brewing Stands.
 * Allows for the automation of many processes
 * Still a work in progress (as indicated by the inventory icon).
 * Added a Trapped Chest that activates redstone
 * Gives out a signal depending on the amount of players looking inside. 1 person = 1 strength signal, 2 people = 2, etc.
 * Crafted with a Chest and a Tripwire Hook.
 * Large Trapped Chests can be staggered with Large Chests to allow more compact storage.
 * Texture is slightly different than a normal chest, with a red stain around the latch.
 * Added Weighted Pressure Plates that detects item stacks
 * Gold version reaches full strength at 60 items.
 * Iron version reaches full strength at 600 items.
 * Linear, so 10 strength signal means twice as many items as a 5 strength signal
 * Added Block of Redstone
 * Stores redstone dust similar to blocks of diamond, etc.
 * Emits constant redstone power
 * Works as pushable redstone power source
 * Added a new Nether Quartz Ore to the Nether
 * Drops 1 Nether Quartz item when mined
 * Generates around Netherrack in the Nether
 * Added a Nether Brick (item) for crafting Nether Brick blocks
 * Obtained by smelting Netherrack
 * Crafting recipe is 2x2 Nether Bricks

Changes

 * Death messages now show the weapon someone was killed with
 * Redstones circuits are more consistent and pistons should be more stable
 * Inventory management changes
 * Double-click items to fill the stack up as much as possible
 * Drag item stacks around to divide them up over the dragged-over slots
 * Drag item stacks around with the right mouse button to place one of that stack in each dragged-over slot, if that slot is not occupied already
 * Shift double click an item stack to move all other item stacks of that kind to that part of the inventory
 * Press Q while the mouse is over an item in the inventory or a container to drop it
 * The texture for the Locked Chest block has been changed
 * Now shows the item name in game

Fixes
2 bugs fixed

From released versions before 1.5
 * – Clocked piston arm turns invisible when exiting game/dying/etc.
 * – (Powered) redstone doesnt update right