This revision includes the following changes:

 - [1] the book-details/index,php file was renamed book/index.php and has completely started over. The book.css, social-icons.png, and Book_Details class all work together to supply the page with new styles and customized data.
 - [2] the root configuration file for this plugin has been updated to version 3.0 and now includes constants which define CDN URLs.
 - [3] the Essentials, Interception_Manager, and Sell_Book_Display classes have updated documentation. The @since Javadoc annotation has been updated to "3.0".
 - [4] the General class was added to manage general display tasks, most notably in generating various kinds of images from the book covers which have been submitted to Cloudinary.