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/event/FPlayerLeaveEvent.java

@@ -10,7 +10,7 @@ public class FPlayerLeaveEvent extends FactionPlayerEvent implements Cancellable
     boolean cancelled = false;
 
     public enum PlayerLeaveReason {
-        KICKED, DISBAND, RESET, JOINOTHER, LEAVE
+        KICKED, DISBAND, RESET, JOINOTHER, LEAVE, BANNED
     }
 
     public FPlayerLeaveEvent(FPlayer p, Faction f, PlayerLeaveReason r) {