Add customs fields, tags and categories to Wordpresss attachments
Based on Rachel McCollin's "Applying Categories, Tags and Custom Taxonomies to Media Attachments" and Guillaume Voisin's "How to Add Custom Fields to Attachments" on WPtuts+
http://wp.tutsplus.com/tutorials/creative-coding/applying-categories-tags-and-custom-taxonomies-to-media-attachments/ http://wp.tutsplus.com/tutorials/creative-coding/how-to-add-custom-fields-to-attachments/