Java Edition 12w03a

12w03a is the first snapshot released for 1.2.1.

Additions

 * Biomes
 * Added jungle biome
 * Thick canopy with jungle trees, vines and fern and brightly-colored grass
 * Jungle wood
 * Slightly-mossy brown textured with horizontal bark
 * Generates in Jungle trees
 * Jungle leaves
 * Generates in Jungle trees

Changes

 * Ladders
 * Ladders regained their collision box
 * Vines
 * Vines are climbable if you push into a solid block while next to them
 * Language Files
 * Updated language files
 * Spawn eggs
 * Dispensers can spawn mobs when dispensing spawn eggs
 * Spawn eggs are now stackable to 64
 * Zombies
 * Zombies have new path-finding AI
 * Wolves
 * Wolves have new AI and can be bred by using chicken (raw or cooked), porkchops (raw or cooked), steak/beef, and rotten flesh when tamed