Create/Update assets for version 13w37a

assets/minecraft/textures/entity/horse/_list.json

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+{"directories":["armor"],"files":["donkey.png","horse_black.png","horse_brown.png","horse_chestnut.png","horse_creamy.png","horse_darkbrown.png","horse_gray.png","horse_markings_blackdots.png","horse_markings_white.png","horse_markings_whitedots.png","horse_markings_whitefield.png","horse_skeleton.png","horse_white.png","horse_zombie.png","mule.png"]}

assets/minecraft/textures/entity/horse/armor/_list.json

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+{"directories":[],"files":["horse_armor_diamond.png","horse_armor_gold.png","horse_armor_iron.png"]}