jacebrowning/doorstop — pull request #111 by jacebrowning (2014-07-11 20:26:07+00:00)
Title: Consider adding `index.yml` to control item levels.

An `index.yml` might look like:

```yaml
- REQ001:
- REQ003:
- REQ007:
- REQ002:
- REQ004:
- REQ005:
- REQ006:
```

One or more of the following could apply:

- `index.yml` replaces `Item.level`
- `index.yml` is read first then applied to each `Item.level`
- `index.yml` is optional