Added invisibility, still need to fix up the code and add a few things. Wouldn't have been possible without the Vanish plugin authors permission to use his code. Double thanks!

vMinecraftParty.java

@@ -9,4 +9,9 @@ public class vMinecraftParty {
             return false;
         }
     }
+    public static double getDistance(Player player1, Player player2)
+    {
+    return Math.sqrt(Math.pow(player1.getX() - player2.getX(), 2) + Math.pow(player1.getY() - player2.getY(), 2)
+    + Math.pow(player1.getZ() - player2.getZ(), 2));
+    }
 }