Update Bukkit for Minecraft 1.4(.2) changes.

src/main/java/org/bukkit/inventory/AnvilInventory.java

@@ -0,0 +1,4 @@
+package org.bukkit.inventory;
+
+public interface AnvilInventory extends Inventory {
+}

src/main/java/org/bukkit/inventory/BeaconInventory.java

@@ -0,0 +1,14 @@
+package org.bukkit.inventory;
+
+public interface BeaconInventory extends Inventory {
+    /**
+     * Set the item powering the beacon.
+     * @param item The new item
+     */
+    void setItem(ItemStack item);
+    /**
+     * Get the item powering the beacon.
+     * @return The current item.
+     */
+    ItemStack getItem();
+}