Added data support for silverfish blocks.

src/main/java/com/sk89q/worldedit/blocks/BlockType.java

@@ -432,6 +432,7 @@ public enum BlockType {
         usesData.add(BlockID.REDSTONE_REPEATER_OFF);
         usesData.add(BlockID.REDSTONE_REPEATER_ON);
         usesData.add(BlockID.TRAP_DOOR);
+        usesData.add(BlockID.SILVERFISH_BLOCK);
         usesData.add(BlockID.STONE_BRICK);
         usesData.add(BlockID.RED_MUSHROOM_CAP);
         usesData.add(BlockID.BROWN_MUSHROOM_CAP);

src/main/java/com/sk89q/worldedit/data/BlockData.java

@@ -493,6 +493,7 @@ public final class BlockData {
         case BlockID.LOG:
         case BlockID.LONG_GRASS:
         case BlockID.STONE_BRICK:
+        case BlockID.SILVERFISH_BLOCK:
             return (data + increment) % 3;
 
         case BlockID.TORCH: