facia tool: draft content

![fronts-tool2](https://cloud.githubusercontent.com/assets/1147913/3415096/15a05f8a-fe1d-11e3-972d-73e4879faa90.png)

Drafts are descending by last-modified date, omitting any that do not have a headline; other filters could be added to reduce noise in the list. The language for both content and fronts is reduced to "draft" (orange) and "live" (green) in accord with Composer.

Draft content is only pressed into draft fronts (consumed by preview.gutools.co.uk), not into live fronts. Drafts are only fetched if the following properties are set: 
```
content.api.draft.host
content.api.draft.key
content.api.preview.user
content.api.preview.password
```