Java Edition 1.9.1-pre1

1.9.1-pre1 is the first pre-release for 1.9.1.

Additions

 * Added elytra sound effects
 * Armor attribute
 * Makes stronger armor take less armor point reduction from attacks
 * New option  in options.txt
 * Setting to false will disable weapon cooldown.

Changes

 * Session ID is now no longer printed by the game to the log files or to the launcher.
 * Entity selector  (count) now sorts on proximity using true coordinates, not coordinates snapped to the grid.
 * Missing an attack no longer triggers the weapon cooldown.
 * Loot tables now also work in dispensers and droppers
 * Dispensers with arrows in jungle temples now use loot tables.
 * Hoppers can now pull items out of blocked chests.
 * Increased limit per tick for scheduled tile ticks from 1,000 to 65,536.
 * Improved AI.

Fixes

 * Other fixes:
 * Fixed game engine trying to mistakenly do things to non-existent mobs, causing instability.