get effective permission

src/cache.js

                 return localStorageService.get('lu_effective_permissions');
             };
 
+            luticateAuthCache.hasEffectivePermissions = function(permission_name)
+            {
+                var permissions = luticateAuthCache.getEffectivePermissions();
+                if (permissions == null) {
+                    return null;
+                }
+                var value = permissions[permission_name];
+                return value == null ? null : value;
+            };
+
             luticateAuthCache.removeEffectivePermissions = function()
             {
                 localStorageService.remove('lu_effective_permissions');