Faction Bans

Adds /f ban, /f unban, and /f banlist
Permission: factions.ban - included with factions.kithalfplayer
Also added as a /f perm that can be granted. Otherwise, defaults to faction mods.
Number of bans now shows up in f show
Banning a player will notify your faction and target player. It'll also kick the player from your faction if they are currently in it.
TODO: make /f banlist prettier

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

@@ -13,6 +13,7 @@ public enum Permission {
     ANNOUNCE("announce"),
     AUTOCLAIM("autoclaim"),
     AUTO_LEAVE_BYPASS("autoleavebypass"),
+    BAN("ban"),
     BYPASS("bypass"),
     CHAT("chat"),
     CHATSPY("chatspy"),