+ - Add XML file caching. [done!]
+ - Remove Root widget, is has no sense with the new autoincluding
+ method. [done!]
+ - Make the proyect modular. [done as a first draft]
+ - Make a Core module with the core classes (Parser, Widget, Container,
+ Fallback). [almost done]
+ - Make a Basic (or Generic?) module with simple implementations of all
+ classes in Core module (Page, Title, Copy, etc). [almost done]
+ - Make other more specific modules (like Album) with other widgets.
+ [almost done]
+ - Fix bugs: all classes should done the dynamic work in the render()
+ method or using __sleep() and __wakeup() because of the new cache
+ capabilities. [started]