Updatet Main.java to provide Multiverse Core compatibility.

Function first tries to move player by using Multiverse Core API. If an Error occures, the player will be moved by Bukkit API. Code is untested yet, but it should work.
Updated Main.java.

Replaced "§" based message coloring with ChatColor Enums to make the code easier for readers.
Update Plugin.yml

Now matching plugin.yml nomenclature.
Updated Main.java.

Now clear onCommand
Merge pull request #1 from Jimpachnet/master

Some fixes and improvements