Added viewLink method to CycleTaskGroupObjectTask and access the task li...

Added viewLink method to CycleTaskGroupObjectTask and access from mustache file to show view link for task. 
The `using` helper handles the reify/refresh pattern better (uses RefreshQueue).  So, please remove the `viewLink` method and use the following pattern instead:

```
{{#using task_group_task=instance.task_group_task}}
  {{#using task=task_group_task.task}}
    ...
  {{/using}}
{{/using}}
```