prismarine items first

prismarine_crystals by 2LEPRECHAUN

![prismarine_crystals](https://cloud.githubusercontent.com/assets/401965/4242582/aa635d34-39ff-11e4-92a5-6396be9d6b2a.png)
![prismarine_shard](https://cloud.githubusercontent.com/assets/401965/4242583/ab587a6c-39ff-11e4-9db3-828d835f0ff1.png)