Java Edition 15w50a

15w50a is the forty-sixth snapshot released for 1.9, released to add sounds and to fix bugs and crashes.

Additions

 * Sounds
 * Added sound assets for existing events:

Changes

 * Hopper
 * Now support loot tables, using the same NBT tags as chests.
 * Pathfinding
 * Improvements to pathfinding with respect to cacti.
 * Improvements to pathfinding with respect to passable blocks.
 * Skeleton
 * No longer seek shade when wearing a helmet.