Pocket Edition v0.12.1 alpha build 1

Alpha 0.12.0 build 1 is the first build version released for Alpha 0.12.0.

Additions

 * The Nether
 * Nether portals
 * Blaze
 * Wither skeleton
 * Nether fortresses
 * Mob heads
 * Sprinting
 * Sneaking
 * Hunger
 * Experience
 * Potions
 * Splash potions
 * Brewing
 * Brewing stands
 * Enchanting
 * Enchantment table
 * Anvils
 * Weather
 * Snow accumulates to multiple layers in snowy biomes
 * Controller support and the controller mapping screen
 * Ocelots and cats
 * Flower pots
 * Cross play with the Windows 10 edition
 * New sounds
 * Golems
 * Iron and snow

Changes

 * Revamped touch controls
 * Changed villager AI