* Add catalog_visibility param to products api
This adds a catalog_visibility=visible option to the product api which
will filter out any products that are excluded from the catalog.
* Add product_visibility phpunit test
* Add catalog_visibility for catalog, search, hidden
* Fix util js test
The util js test checks for query parameters, so this adds the
category_visibility = 'visible' param.
* Updated for comments
1. Added collection params
2. moved catalog_visibility default with others
* Add a prop to turn on “single choice” mode
* Create new ProductControl to select a single product
* Remove align from shared attributes
This is given to us by default for using supports.align
* Add Featured Product block
* Fix spelling mistake & copy-paste issue
* Fix lint warning
* Add featured product script to build process, register block in PHP
Kelly Dwan
Timmy Crawford
Kevin Killingsworth