- PERF: Fix the role based auth service to not recalculate permission checks again and again.

- Adding some comments to the authorization event handler interface.

--HG--
branch : dev

src/Orchard.Web/Modules/Orchard.Roles/Services/RolesBasedAuthorizationService.cs

@@ -84,6 +84,8 @@ namespace Orchard.Roles.Services {
 
                 context.Adjusted = false;
                 _authorizationServiceEventHandler.Adjust(context);
+                if (!context.Adjusted)
+                    break;
             }
 
             _authorizationServiceEventHandler.Complete(context);