Add Permissable interface for f perm compatibility.

Allows Roles and Relations to be permissable, so we can set f perms for both of those in the same map.

src/main/java/com/massivecraft/factions/struct/Role.java

@@ -1,9 +1,10 @@
 package com.massivecraft.factions.struct;
 
 import com.massivecraft.factions.Conf;
+import com.massivecraft.factions.zcore.fperms.Permissable;
 import com.massivecraft.factions.zcore.util.TL;
 
-public enum Role {
+public enum Role implements Permissable {
     ADMIN(3, TL.ROLE_ADMIN),
     MODERATOR(2, TL.ROLE_MODERATOR),
     NORMAL(1, TL.ROLE_NORMAL),