Java Edition 14w25a

14w25a is the twenty-seventh snapshot released for 1.8.

Additions

 * Added a new boss mob Name unknown found within the Ocean temples.
 * Added a new hostile mob, the Guardian.
 * Added Prismarine, Prismarine bricks, Dark Prismarine, and sea lanterns.
 * Added Prismarine crystals and shards.

Changes

 * Introduced sponges to survival, with new behavior and looks.
 * Rewrote how items are rendered.
 * Rewrote how blocks are rendered.
 * Rewrote how block data is handled.
 * Smelt stone bricks for cracked stone bricks.
 * Changed the texture of leaves on fast graphics setting. (Possible bug, as all of the textures, excluding spruce leaves, are the same.)