Added full tile entity data support for all block types that use it, including chests, dispensers, furnaces, mob spawners, and note blocks.

src/main/java/org/bukkit/block/ContainerBlock.java

@@ -0,0 +1,17 @@
+package org.bukkit.block;
+
+import org.bukkit.inventory.Inventory;
+
+/**
+ * Indicates a block type that has inventory.
+ * 
+ * @author sk89q
+ */
+public interface ContainerBlock {
+    /**
+     * Get the block's inventory.
+     * 
+     * @return
+     */
+    public Inventory getInventory();
+}