Add Faction vaults.

These can be accessed with /f vault <number>
Set a Faction's max vaults with /f setmaxvaults <faction> <number> - can be run from console so Buycraft can execute it.
* This is a not very tested implementation. Should be tested more in depth before being pushed to a release.

src/main/java/com/massivecraft/factions/Faction.java

@@ -27,6 +27,10 @@ public interface Faction extends EconomyParticipator {
 
     public void clearWarps();
 
+    public int getMaxVaults();
+
+    public void setMaxVaults(int value);
+
     public void addAnnouncement(FPlayer fPlayer, String msg);
 
     public void sendUnreadAnnouncements(FPlayer fPlayer);