Resolve #219 - Handle t1__ more objects

[Slord6]

Builds on @czf 's changes in PR 224 to allow for More in Comment response.

Resolves #219 and now handles "Continue this thread" More-like objects eg:

{
  "count": 0,
  "name": "t1__",
  "id": "_",
  "parent_id": "t1_cydnx3d",	
  "depth": 10,
  "children": []
}

[CrustyJew]

I'd like a couple changes on that, but otherwise looks good. Thanks!

[czf]

@Slord6 is there a test you can add in addition to GetCommentsWithMoresAsync or modify that test to cover the missed case?