Adds GTIN field for WooCommerce Product.

Allows to include images of books by asin or isbn from amazon through a simple tag: [abp:ISBN]

Allows to include a downloadlink or flash player for mp3 files via a tag, e.g. [mp3player:myalbum/mysong.mp3]

Widget to give an overview of your currently reading books on goodreads, whitout the use of API.

MPN, ISBN, GTIN-8, UPC, EAN, GTIN-14, net dimensions, and fluid volume for better WooCommerce Schema markup.