Update for 1.1_01 renames.

We know these updates (can) break plugins bypassing Bukkit. They are needed for
smooth updates however. There will be another one right before before 1.1-R1.

src/main/java/net/minecraft/server/BlockLever.java

@@ -130,7 +130,7 @@ public class BlockLever extends Block {
         }
     }
 
-    public void b(World world, int i, int j, int k, EntityHuman entityhuman) {
+    public void attack(World world, int i, int j, int k, EntityHuman entityhuman) {
         this.interact(world, i, j, k, entityhuman);
     }