Changed how plugins will interact with each other

+ some refactoring
Renamed NPunisher to NPlayer
Added TheEndAgain and EnchantingEgg nodes

+ added some forgotten API packages
Major change in packages names

- Change com.github.ribesg.* to fr.ribesg.bukkit.*
- Finish renaming NEnd to NTheEndAgain
- Finish renaming NEgg to NEnchantingEgg