Fixed problems:
- A better update checker
- Fixed some messages
- A better check in wich world the player is

New Features:

/ecokits - Open a GUI where you can see the kits and their prices (Prices are configurable in config.yml)

Command alliases:
Added a allias for the /ecokit command, /kit is also working right now.
Added a allias for the /ecokits command /kits is also working right now.