Pocket Edition v0.12.1 alpha build 13

Alpha 0.12.1 build 13 is the thirteenth build released for Alpha 0.12.1.

Changes

 * Improved water climbing against a wall
 * Improved pathfinding of mobs inside fences
 * Changed some sounds volume
 * Better ordering on chunk scheduling
 * Added ghast sounds

Fixes
10 bugs fixed
 * Fixed a crash when a client joins a suspended server
 * Fixed released button not going back to the unpressed state
 * Fixed placing flower pots on upside-down slabs and stairs
 * Fixed creating an old world glitching the edit menu
 * Fixed sounds not playing when player jumps on snow
 * Fixed nether portal not loading properly for clients
 * Fixed some rendering of items in third-person mode and other player hands
 * Fixed zombie walking sounds
 * Fixed fishing not working properly in multiplayer.
 * Fixed bobber not disappearing on lava