Acegi's Integer-masked ACL

Finally, a permission masking that works like chmod in Linux. This is the kind of ACL that makes sense in every Java EE applications. By using Acegi's Integer-masked ACL, permissions and groupings are not directly wired up together. Which is a common flaw in most Java EE applications past and present. This means it will be easier to implement a "by-group" permission. More on this later.