Java Edition 16w21b

16w21b was released to fix some bugs and crashes from 16w21a.

Additions

 * Splash text
 * "Rule #1: it's never my fault"
 * "Replaced molten cheese with blood?"
 * "Absolutely fixed relatively broken coordinates"
 * "Boats FTW"

Changes

 * Commands
 * relative coordinates are now relative to the executor of the command, not the teleported entity.
 * can be used to get the old behavior.
 * can now teleport the player to a y-coordinate in the range -4096 to 4096 (increased from -512 to 512).