Implemented Entity and Living.

* Implemented getEntityClass for EntityType.
* Fixed wrong EntityType mappings for LargeFireball and MinecartTNT.
* Updated API
Enforce unqualified access to instance field.
Impl of Block/Item expansion
Merge pull request #86 from Deamon5550/feature/block-expansion

Impl of Block/Item expansion
Merge branch 'master' into hanging-entities