Pocket Edition v0.13.0 alpha build 2

Alpha 0.13.0 build 2 is the second build version released for Alpha 0.13.0.

Changes

 * Obsidian now breaks in 6.5 seconds rather than 3
 * Minecarts now stack on top of each other
 * Villagers now open doors of all kinds

Fixes
13 bugs fixed
 * The terrain doesn't flicker invisible anymore when too many chunks are active
 * Fixed a crash when it's night in a village and you're holding a door not made of oak
 * The held item's movement in first person is more fluid now
 * Fixed mobs disappearing after going through a portal
 * Removed redundant tripwire recipes
 * Single pieces of redstone dust now only get powered from below
 * Doors now pop correctly when destroyed by removing the block below them
 * Mobs aren't pulled immediately back into minecarts after being thrown out
 * Ocelot mob heads don't disappear anymore
 * Block of redstone is now properly translated
 * Fixed item duplication glitch in the anvil
 * Fixed various redstone-related bugs and inconsistencies
 * Fixed corrupted images in the language screen