Java Edition 13w11a

13w11a is the first snapshot released for 1.5.1.

Changes

 * Enchanted Books can now be combined to raise their enchantment level or combine multiple enchantments on a single book
 * When combining two enchantments for a higher level variation, the player requires two of the same level enchanted book
 * They are still subject to the normal enchantment level limits.
 * A few Minecraft Realms changes

Fixes
8 bugs fixed

From released versions before 1.5.1
 * – Ender Dragon can still grief stuff like cobblestone and chests even if the gamerule mobGriefing is set on false.
 * – Unable to combine enchanted books for a higher level enchant.
 * – Hopper doesn't try to place items from other slots if unable from first.
 * – Fire doesn't show on 8 layered snow and hopper
 * – Long scoreboard objective titles can be offset screen
 * – Breaking a Container with Items that is connected via a solid block with a Comparator does not update the Comparator
 * – Falling Block entities start visually falling from 1 block higher than they were placed
 * – Paintings popping out / cannot place new ones