[BUG] Multilevel external documents tree is generated incorrectly

[andriisalamatin]

Overview of the issue

Multilevel external documents tree is generated incorrectly

Operating System, Node.js, npm, compodoc version(s)

MacOS 10.13.3, Node v7.10.1, npm 4.2.0, compodoc 1.0.7
...
"@compodoc/gulp-compodoc": "0.0.6",
...

Compodoc installed globally or locally ?

locally

Motivation for or Use Case

because it brakes pages documents tree

Reproduce the error

Use summary.json:

[
  {
    "title": "1",
    "file": "/1.md"
  },
  {
    "title": "2",
    "file": "/2/index.md",
    "children": [
      {
        "title": "21",
        "file": "/21/21.md"
      },
      {
        "title": "22",
        "file": "/22/22.md"
      },
      {
        "title": "23",
        "file": "/23/23.md"
      }
    ]
  },
  {
    "title": "3",
    "file": "/3.md"
  }
]

generate documentation

Expected navigation:

1
2
21
22
23
3

Results:

1
2
21
3
22
23

Suggest a Fix

Issue could not be reproduced in version 1.0.5, so as temporary fix can be direct specification old version:
...
"@compodoc/compodoc": "1.0.5",
...

This commit is probably source of issue
4061795

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