New features

Adds #2896351: Add bundle to children page if appropriate

Initial release with full functionality.

Add new ability to define custom CSS override for the declarations shipped with the module. See https://www.drupal.org/node/2880200 and README.txt

• Added a permission to the Cronpub-plugin Interface that allows to define permissions for the use of the included plugins (publish, sticky, promote).
• Fixed the issue, that user without permisions can enter values to the cronpub form.

Used Spl interfaces instead of custom ones.