This is how to create a plugin for CKEditor. I also show how to integrate it with the WYSIWYG module. It was tested on CKEditor 4.3.4 and the WYSIWYG module version 7.x-2.x-dev from 2014-Mar-20.
"Panels Breadcrumbs allows you to set your breadcrumbs directly from Panels configuration, and also allows you to take advantage from Panels arguments and contexts as placeholder tokens."