Jwt's now feature group permissions and permission deduplication

ref #6

src/jwtcreator.ts

@@ -104,6 +104,11 @@ export class JwtUser {
         for (let permission of user.permissions) {
             returnPermissions.push(permission.toString());
         }
-        return returnPermissions;
+        for (let group of user.groups) {
+            for (let permission of group.permissions) {
+                returnPermissions.push(permission.toString());
+            }
+        }
+        return Array.from(new Set(returnPermissions));
     }
 }