Java Edition 14w02a

14w02a is the first snapshot released in 2014, and the first snapshot for 1.8. It was followed by 14w02b.

Additions and Changes
All baby animal growth can now slowly be accelerated using the animal's breeding item
 * Added Slime Blocks
 * Crafted with 9 Slimeballs, can also be crafted back into 9 Slimeballs
 * Players, mobs and particles that land on their top side will bounce, as if on a trampoline
 * Bounce rebound velocity is scaled by impact velocity
 * A bounce can be avoided by holding spacebar
 * Prevents fall damage
 * Walking on them is slower than walking on Soul Sand, about the speed of sneaking
 * Added Granite, Diorite and Andesite
 * Generates within Stone terrain below y=80, each in veins similar in size and abundance to Gravel or Dirt.
 * Diorite can be crafted with 2 Cobblestone and 2 Nether Quartz in a checker board pattern
 * Andesite can be crafted with 1 Cobblestone and 1 Diorite
 * Granite can be crafted with 1 Nether Quartz and 1 Diorite
 * Can be crafted, with 4 of the raw stone in a 2x2 configuration, into Polished Granite, Polished Diorite, and Polished Andesite, respectively
 * These 6 have the same data value, blast resistance, mining time, and other properties as Stone
 * Added Crafting Recipes for blocks previously only obtainable from generated structures
 * Mossy Stone Bricks, crafted using 1 Vine and 1 Stone Brick
 * Chiseled Stone Bricks, crafted using 2 Stone Brick Slabs on top of each other, similar to Chiseled Sandstone
 * Changes to the Enchanting System''
 * Enchanting will now cost 1 to 3 levels of experience and lapis lazuli, depending on the tier
 * You still need the same minimum levels displayed on the enchantment table to enchant
 * The actual enchantment calculation is the same
 * One of the enchantments will be displayed in the tooltip
 * The enchantments you would get will not change until you enchant it, or enchant something else
 * This enchantment seed is stored per player
 * Changes to Anvils
 * The cost of experience is now reduced
 * Renaming items will now only cost 1 level, repairing will now start out with 2 to 5 levels and tools can be repaired longer and with better enchantments, repairing costs can no longer be kept down by renaming items
 * Changes to Experience
 * Leveling up now takes more experience
 * Changes to Villager Trading
 * Offers will be less random and probably more useful
 * Existing villagers will not be affected
 * Trading now gives experience
 * Villager profession is now displayed in trade GUI
 * Villagers start out with 2-4 trades unlocked
 * There are now more villager professions (only notable trade changes and additions listed)
 * White robe:
 * Librarian (now buys stacked written books, can now offer different enchanted books)
 * Purple robe:
 * Cleric (now sells 1-4 pieces of redstone, sells lapis, buys ender pearls and rotten flesh)
 * Brown robe:
 * Fisherman (buys string, coal, cooks normal fish, sells enchanted fishing rods)
 * Farmer (no longer sells melons, buys melon blocks, pumpkins, potatoes, carrots, sells cake and pumpkin pie)
 * Fletcher (buys string, sells bows, converts 10 gravel into about 7-10 flint *does not work in 14w02c*)
 * Shepherd (sells colored wool, buys normal wool, and sells shears)
 * White apron:
 * Butcher (buys raw meat, sells cooked meat)
 * Leatherworker (buys leather, sells leather armor, enchanted leather armor, and saddles)
 * Black apron: (note, all villagers with a black apron still buy iron ingots, diamonds, and coal)
 * Armorer (sells enchanted diamond armor, iron armor, chain armor)
 * Tool Smith (sells enchanted iron shovel/pick and enchanted diamond pick)
 * Weapon Smith (sells enchanted iron sword, enchanted diamond sword, enchanted diamond axe, iron axe)
 * The disabled trade arrow now has a descriptive tooltip
 * Trades are now unlocked more freely (No longer requires trading last trade)
 * Villagers will now only breed when willing
 * The first time a specific trade is done, the villager will become willing, any other time there's a 1 in 5 chance the villager will become willing
 * When a baby villager is born, both parents lose their willingness
 * Finding out a villager's willingness in survival is difficult: The only tell is the amount of xp they give when trading; Normal trading yields 3-6 experience points, trading and making a villager willing yields 8-11 experience points
 * Changes to Adventure Mode
 * Block interaction is now impossible by default
 * Block outlines do not show unless block can be interacted with
 * Added CanDestroy NBT tag for tools
 * Items with this tag display the names of the blocks that they can destroy in the item tooltip, example: to give a Diamond Shovel that can break grass and sand)
 * Added a way to lock containers from being opened using NBT tags
 * Mostly useful for (adventure) maps in adventure mode
 * NBT Tag in JSON format:, containers can be unlocked by clearing their string for Lock (changing it to  )
 * The lock can be completely removed utilizing the command
 * Locked containers can only be opened while holding an item renamed to the given string
 * Example: If the value of the Lock tag is "Key", a player will not be able to open the chest unless they are holding an item named Key
 * Item is not removed on use
 * Only works if the item has a custom name (default names will not work)
 * Example: a chest with the tag  cannot be opened when holding a diamond; the item held must be renamed Diamond
 * Changes to Wooden and Iron Doors
 * Doors can now stack to 64
 * Crafting recipe now gives 3 Doors
 * Changes to Boats
 * They now break (into sticks and wooden planks) when landing on a solid surface after falling more than 3 blocks
 * Changes to Furnaces
 * When a furnace runs out of fuel, the smelting progress will pause instead of resetting
 * Is a bug
 * Changes to Food
 * Carrots restore 3 hunger points instead of 4
 * Baked Potatoes restore 5 hunger points instead of 6
 * Changes to Baby Animals
 * Feeding baby animals their corresponding food item may cause them to grow in less than twenty minutes
 * Baby animals make particles when right clicked with the proper food
 * They will randomly consume it and grow up instantly
 * Changes to the Difficulty Setting
 * Difficulties now save per world
 * Can be locked in a specific difficulty per world
 * Prevents accidentally changing the difficulty when joining the world
 * Locking cannot be undone
 * Changes to the F3 menu
 * Now shows which axis you are facing after the cardinal direction: "Towards positive/negative X/Z"
 * Changes to Teleporting
 * Relative teleporting is smoother and no longer brings players to a stop; it preserves their velocity from before the teleport
 * Added a new Splash
 * "That's Numberwang!"
 * Added commands that can target entities via the new target selector 
 * Can specify type of entity by entity ID to either include or exclude with  or , example:
 * Changes to the command
 * Now has a target selector argument
 * Can kill entities (including players) other than player that ran the command
 * Can now be used by command blocks
 * Changes to the command
 * Can be used to clear only a specific number of items and can be restricted to certain NBT data, example: will remove up to 34  villager spawn eggs named Michael from yourself; Note: Maximum removal item count does not work correctly (fixed in 14w02c)
 * Added the command
 * Can amend and modify the NBT data of the block at specified coordinates
 * Changes to Chat Communication
 * Messages are now either chat, system or action bar messages
 * Action bar messages are always shown, chat and system messages are only shown if chat settings are configured that way
 * Some instances of usernames in the chat will now show the player's UUID when hovered on when debug tooltips are enabled
 * Changes to the command
 * Can now also check for dataTags, example:
 * No longer is exclusively usable in command blocks
 * Changes to Usernames
 * Some instances of usernames in the chat will now show the player's UUID when hovered on when debug tooltips are enabled
 * Changes to baby mobs
 * All baby animal growth can now slowly be accelerated using the animal's breeding item

Fixes

 * – Villagers ignore damage values and item tags in trading
 * – Players can place and remove arbitrary blocks in Adventure mode, breaking pre-1.4.2 maps
 * – Random destination routine has a small statistical tendency to move more north west (fix included)
 * – Clicking hotbar hotkey (1-9) to move a stack of items / blocks to enchanting table deletes all but one of a stack
 * – Zombies kill villagers instead of transform them (HARD difficulty)
 * – Chicken Jockeys causing lag on Multiplayer servers