Added ChunkSnapShot improvements. Thanks mikeprimm!

Added support for biome data to chunk snapshot
Added method for returning empty chunk snapshot (for ungenerated chunks)

src/main/java/org/bukkit/Chunk.java

@@ -46,6 +46,15 @@ public interface Chunk {
      */
     ChunkSnapshot getChunkSnapshot();
 
+    /**
+     * Capture thread-safe read-only snapshot of chunk data
+     * @param includeMaxblocky - if true, snapshot includes per-coordinate maximum Y values
+     * @param includeBiome - if true, snapshot includes per-coordinate biome type
+     * @param includeBiomeTempRain - if true, snapshot includes per-coordinate raw biome temperature and rainfall
+     * @return ChunkSnapshot
+     */
+    ChunkSnapshot getChunkSnapshot(boolean includeMaxblocky, boolean includeBiome, boolean includeBiomeTempRain);
+
     Entity[] getEntities();
 
     BlockState[] getTileEntities();