anchor.diff:  - **timestamp** [Integer]: todo.
   - **result** [String or null]: Description of the task's result. Will not be populated (string) unless tasks finishes.
   - **user** [String]: User which started the task.
  -- **context_id** [String or null]: Context ID of the task, if provided when task was created.
  +- **context_id** [String]: Context ID of the task, if provided when task was created, otherwise empty string.
   
   #### Example
   
  
positive.code:     "timestamp": 1447031334,
      "result": "scan and fix complete",
      "user": "admin",
      "context_id": null
    }
  ]
  ```
  
negative.code:     "timestamp": 1447033291,
      "result": null,
      "user": "admin",
      "context_id": ""
    }
  ]
  ```
  