Update CraftBukkit to Minecraft 1.4(.2).

src/main/java/org/bukkit/craftbukkit/inventory/CraftInventoryAnvil.java

@@ -0,0 +1,10 @@
+package org.bukkit.craftbukkit.inventory;
+
+import net.minecraft.server.IInventory;
+import org.bukkit.inventory.AnvilInventory;
+
+public class CraftInventoryAnvil extends CraftInventory implements AnvilInventory {
+    public CraftInventoryAnvil(IInventory anvil) {
+        super(anvil);
+    }
+}

src/main/java/org/bukkit/craftbukkit/inventory/CraftInventoryBeacon.java

@@ -0,0 +1,19 @@
+package org.bukkit.craftbukkit.inventory;
+
+import net.minecraft.server.TileEntityBeacon;
+import org.bukkit.inventory.BeaconInventory;
+import org.bukkit.inventory.ItemStack;
+
+public class CraftInventoryBeacon extends CraftInventory implements BeaconInventory {
+    public CraftInventoryBeacon(TileEntityBeacon beacon) {
+        super(beacon);
+    }
+
+    public void setItem(ItemStack item) {
+        setItem(0, item);
+    }
+
+    public ItemStack getItem() {
+        return getItem(0);
+    }
+}