Update src/com/apocalyptech/minecraft/xray/ChunkAnvil.java

Now we can read real Block with ID higher then 256
before we never get high 4 bit fot block
Update src/com/apocalyptech/minecraft/xray/Chunk.java

Thaumcraft store now its data in region file and causes exception. We use now tag's name "Level" , not position.
Merge pull request #4 from woodenone/master

Trying to learn how to correct make pull request