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/struct/Permission.java

@@ -78,6 +78,8 @@ public enum Permission {
     SEECHUNK("seechunk"),
     SETWARP("setwarp"),
     TOP("top"),
+    VAULT("vault"),
+    SETMAXVAULTS("setmaxvaults"),
     WARP("warp");
 
     public final String node;