Added brand() and category() methods to Product model
Added CatalogNode which mimics Node class
Added Node methods to Brand, Category and Product
Use models instead of helper classes
Update BrandListPage as well
Deleted files that are no longer necessary
Implementation of category->children()
Use uri() method for backward compatibility
Move required Wolf version to 0.7.6
Fix root parent
New routing syntax for Wolf 0.7.6
Use category() accessor in parent()
Added subcategories() methods