- [grunt] added `dir` into `data.sitemap` as possible improvement
- [grunt] added one more possible usecase into `data.sitemap`
- [grunt] actually we don't need full info about parents in `data.sitmeap`. Array of parents slugs would be enough
- [nj] updated breadcrumbs code examples to correspond latest changes
- [grunt] `page` in `data.sitemap` is now optional - it should be specified only in case page has different from `index.html` filename
- [nj] updated `href`s in example code to append `page` from `data.sitemap` only in case it specified in json