#144: provide image gallery article type

Need to implement a class called ImageGallery to hold a collection of images. Features:

• upload an archive (.zip, .tar.gz, etc) with all the images and explode them into the gallery (or use multiple upload system like Jupload)
• accept only images as children
• list thumbnails as its to_html; clicking the thumbnails takes the user to the image itself
• pagination
• accept comments (+ moderation)
• accept a legend (subtitle)
• allow user to create multiples galleries

• gallery is a special type of folder
• when displaying the gallery, it must behave and look like a image gallery
• when viewing the gallery, its items must be shown as a image gallery (rather than as a regular filemanager-like folder)
• a gallery can have sub-galleries.

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Considere ao menos 2 horas pra mim -- AurelioAHeckert - 31 Jul 2008