version 1.2.1 :
 Fix bug that name is overwritten with id.
 Fix bug that the server crashes if no chunks are loaded.
version 1.2.0 :
 Add BlockState Type.(You can now rotate a block!)
version 1.1.0 :
 Add a new block model type: Cage.
 Add a new block render-type: Cage.
version 1.0.0 :
 First release.