Complete the Microdata & schema.org info

[joseluis]

Reading material & sources:

• https://support.google.com/webmasters/answer/176035
• http://html5doctor.com/microdata/
• http://stackoverflow.com/questions/10279277/do-you-put-schema-microdata-meta-tags-in-the-html-body
• http://www.w3.org/TR/microdata/
• http://schema.org/docs/full.html
• http://leaves-and-love.net/how-to-improve-wordpress-seo-with-schema-org/
• https://gist.github.com/gregrickaby/5917114
• http://longren.io/add-schema-org-markup-to-any-wordpress-theme/
• http://longren.io/adding-schema-org-markup-to-your-wordpress-themes/
• https://github.com/tlongren/wordpress-child-example/blob/master/functions.php
• https://github.com/Automattic/_s/issues/510