Features desired

- [x] `test.request.body` should be object when `Content-Type` is `application/json`
- [ ] Should not display pending test if invoke abao with `--hook-only`
- [x] Should give a warning if `Content-Type` is not `application/json`
- [ ] Should give a warning if hook is ignored
- [ ] Let hook's `done` param optional
- [ ] Validate fail if an array field contains no elements
- [ ] [gulp-abao](http://github.com/cybertk/gulp-abao)
- [ ] [grunt-abao](http://github.com/cybertk/grant-abao)
- [ ] [abao-example](http://github.com/cybertk/abao-example)

The issue is a broad checklist covering test.request.body, --hook-only behavior, hook warnings and callbacks, array validation, and gulp-abao, grunt-abao, and abao-example integrations. Start by locating the entry points for these features and reviewing the existing tests; done would require agreed scope and completion of the selected unchecked items.

Written by the indexing model from the issue text.