Further grunting

- Cleanup license/banners
- Add info to package.json

I think the authors/contributors section needs a look because according to the [spec](https://npmjs.org/doc/json.html#people-fields-author-contributors) authors should be a single [person](https://github.com/gruntjs/grunt/blob/master/package.json#L5) or [group](https://github.com/jquery/jquery-mobile/blob/master/package.json#L8)