New Features
BUKKIT-2443: Added overloads for the playSound methods that allow to pass raw sound names instead of an enum.
BUKKIT-4459: Add functions to link entities via leads
BUKKIT-4583: Implement Leash API
BUKKIT-4590: Allow plugins to specify client-side max health
Fixed Bugs
BUKKIT-2110: Vehicle exit does not cancel on setCancelled(true)
BUKKIT-3653: PotionEffect.isAmbient() always returns true
BUKKIT-3761: VehicleExitEvent does not trigger.
BUKKIT-4127: Eating food when maxHealth is above 20 makes the health bar jump to max
BUKKIT-4154: Place blocks in spawn protection
BUKKIT-4357: Ambience is ignored when applying effects to mobs
BUKKIT-4393: Horses cannot be detected as entities
BUKKIT-4395: Cancelling a PlayerInteractEntityEvent for a leash does not display correctly
BUKKIT-4396: Cancelling a PlayerInteractEntityEvent with a Name Tag does not cancel correctly
BUKKIT-4397: Animals despawn when they shouldn't
BUKKIT-4398: entity.setMaxHealth() fails for values higher than a mobs unmodified max health
BUKKIT-4405: Sheep don't regrow wool after shearing
BUKKIT-4407: World spawn preparation status outputs incorrect values
BUKKIT-4409: ServerListPingEvent changes not used by server
BUKKIT-4416: Removing a potion effect not working
BUKKIT-4419: Latest Bukkit development version breaks compatibility with all kinds of tools.
BUKKIT-4424: Horse Tame
BUKKIT-4431: Increasing max health causes strange behavior
BUKKIT-4439: Arrow.isOnGround() always returns false
BUKKIT-4449: Ocelots spawn out of control
BUKKIT-4462: You gain 2x more food from eating than you're supposed to
BUKKIT-4474: Craftbukkit.jar binding to loopback / ignoring server-ip setting when using --level-name parameter
BUKKIT-4483: AttributeModifiers disappear when mousing over the item
BUKKIT-4493: StructureGrowEvent.getPlayer() yields null
BUKKIT-4523: You cannot enchant any item that has custom attributes wit nbtedit, with out the custom attributes going away
BUKKIT-4531: Animals endless sprint after being hit
BUKKIT-4535: Player#setScaleHealth() does not work as expected
BUKKIT-4536: Players with different maximum health don't always have their multiple rows of health show up properly
BUKKIT-4543: isPlayerCreated in CraftIronGolem not working correct
BUKKIT-4565: Players not attached to horses
BUKKIT-4576: Client has bad entity states following PlayerInteractEntityEvent
BUKKIT-4586: .getHolder() of horses inventory returns null
BUKKIT-4628: Player not being attached to vehicle properly
BUKKIT-4641: Player.playSound throws IllegalArgumentException
BUKKIT-4642: Unknown command displays "help" instead of "/help" to players