Remove unused imports.

src/main/java/com/gmail/nossr50/listeners/WorldListener.java

@@ -8,7 +8,6 @@ import org.bukkit.event.Listener;
 import org.bukkit.event.world.ChunkLoadEvent;
 import org.bukkit.event.world.ChunkUnloadEvent;
 import org.bukkit.event.world.WorldInitEvent;
-import org.bukkit.event.world.WorldSaveEvent;
 import org.bukkit.event.world.WorldUnloadEvent;
 
 import com.gmail.nossr50.mcMMO;

src/main/java/com/gmail/nossr50/skills/mining/SuperBreakerEventHandler.java

@@ -1,7 +1,6 @@
 package com.gmail.nossr50.skills.mining;
 
 import org.bukkit.Material;
-import org.bukkit.Sound;
 import org.bukkit.block.Block;
 import org.bukkit.entity.Player;
 import org.bukkit.inventory.ItemStack;

src/main/java/com/gmail/nossr50/util/blockmeta/HashChunkletManager.java

@@ -15,7 +15,6 @@ import org.bukkit.Bukkit;
 import org.bukkit.World;
 import org.bukkit.block.Block;
 
-import com.gmail.nossr50.mcMMO;
 import com.gmail.nossr50.runnables.ChunkletUnloader;
 
 public class HashChunkletManager implements ChunkletManager {