Put classes in package to be more compatible with Bukkit.

src/main/java/org/dynmap/TileUpdate.java

@@ -0,0 +1,14 @@
+package org.dynmap;
+
+/* this class stores a tile update */
+
+public class TileUpdate {
+	public long at;
+	public MapTile tile;
+
+	public TileUpdate(long at, MapTile tile)
+	{
+		this.at = at;
+		this.tile = tile;
+	}
+}