Version 4.0.0

* Renamed project from `Kraken for WordPress` to `Keel`.
* Added semantic versioning.
* Converted to Gulp.js workflow.
* Added PHPDoc documentation.
* Added `print_a` and `get_page_id_from_path` functions from [Starkers](https://github.com/viewportindustries/starkers/).
* Added custom WP comments callbacks and functions.
* Added `$content_width` variable.
* Added featured image support.
* Added named navigation menus.
* Added `author.php` template.
* Added `keel_` prefix to all utility methods.
* Added inline documentation throughout template files.