Tackle TODO's (Material.gourd & Landmine/Firework death message)

This takes 4 TODO's off the list. I also put in the firework death message which didn't have a TODO because it was in the en_US.lang and I assumed it was to be done at some point.

![image](https://cloud.githubusercontent.com/assets/2399411/3804867/7d880d0a-1c2c-11e4-87c1-95bef6d7dcf7.png)