Mention what nbt file is broken. Fixes #124.

src/com/massivecraft/mcore/util/IdUtil.java

@@ -958,7 +958,8 @@ public class IdUtil implements Listener, Runnable
 		}
 		catch (Exception e)
 		{
-			e.printStackTrace();
+			String message = Txt.parse("<b>NBT file couldn't be loaded: <h>%s<b>. Error: %s.", file.toString(), e.getMessage());
+			MCore.get().log(message);
 			return null;
 		}
 	}

src/com/massivecraft/mcore/util/MUtil.java

@@ -24,6 +24,7 @@ import java.util.TreeSet;
 import org.bukkit.Location;
 import org.bukkit.Material;
 import org.bukkit.World;
+import org.bukkit.block.Block;
 import org.bukkit.block.BlockFace;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Entity;
@@ -142,6 +143,46 @@ public class MUtil
 		return recurseResolveMap(output, map);
 	}
 	
+	// -------------------------------------------- //
+	// GET BLOCKS
+	// -------------------------------------------- //
+	
+	public static List<Block> getBlocks(Location location, int halfWidth)
+	{
+		return getBlocks(location.getBlock(), halfWidth);
+	}
+	
+	public static List<Block> getBlocks(Block block, int halfWidth)
+	{
+		int xmin = block.getX() - halfWidth;
+		int ymin = block.getY() - halfWidth;
+		int zmin = block.getZ() - halfWidth;
+		
+		int xmax = block.getX() + halfWidth;
+		int ymax = block.getY() + halfWidth;
+		int zmax = block.getZ() + halfWidth;
+		
+		return getBlocks(block.getWorld(), xmin, ymin, zmin, xmax, ymax, zmax);
+	}
+	
+	public static List<Block> getBlocks(World world, int xmin, int ymin, int zmin, int xmax, int ymax, int zmax)
+	{
+		List<Block> blocks = new ArrayList<Block>();
+		
+		for (int x = xmin; x <= xmax; x++)
+		{
+			for (int y = ymin; y <= ymax; y++)
+			{
+				for (int z = zmin; z <= zmax; z++)
+				{
+					blocks.add(world.getBlockAt(x, y, z));
+				}	
+			}
+		}
+		
+		return blocks;
+	}
+	
 	// -------------------------------------------- //
 	// LOCATIONS COMPARISON
 	// -------------------------------------------- //

src/com/massivecraft/mcore/util/PeriodUtil.java

@@ -0,0 +1,69 @@
+package com.massivecraft.mcore.util;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class PeriodUtil
+{
+	// -------------------------------------------- //
+	// MILLIS STORE
+	// -------------------------------------------- //
+	
+	private static Map<Object, Long> objectToMillis = new HashMap<Object, Long>();
+	
+	public static long getMillis(Object object)
+	{
+		Long ret = objectToMillis.get(object);
+		if (ret == null) ret = 0L;
+		return ret;
+	}
+	
+	public static void setMillis(Object object, Long millis)
+	{
+		if (millis == null || millis == 0)
+		{
+			objectToMillis.remove(object);
+		}
+		else
+		{
+			objectToMillis.put(object, millis);
+		}
+	}
+	
+	// -------------------------------------------- //
+	// RANDOM SIMPLE
+	// -------------------------------------------- //
+	
+	public static long getPeriod(long length, long now)
+	{
+		return now / length;
+	}
+	
+	public static long getPeriod(long length)
+	{
+		return getPeriod(length, System.currentTimeMillis());
+	}
+	
+	public static long getLastPeriod(Object object, long length)
+	{
+		return getPeriod(length, getMillis(object));
+	}
+	
+	public static boolean isNewPeriod(Object object, long length, long now)
+	{
+		long currentPeriod = getPeriod(length, now);
+		long lastPeriod = getLastPeriod(object, length);
+		
+		if (currentPeriod == lastPeriod) return false;
+		
+		setMillis(object, now);
+		
+		return true;
+	}
+	
+	public static boolean isNewPeriod(Object object, long length)
+	{
+		return isNewPeriod(object, length, System.currentTimeMillis());
+	}
+	
+}