[Nitro] Partially solution.

[Alexey Petrushin]

Partially solution. It's possible to implement subject this way:

    class Item
      property :name, String
      belongs_to :parent, Object
    end

    class Container < Item
      has_many :items, Item
    end

    class Folder < Item
      has_many :items, Item
    end

But, there are major disadvantages:
- Code duplication, each 'Container' should explicitly include 'has_many 
...'.
- Instead of 'Item' you forced to use 'Container::Item' and 
'Folder::Item' and remember about it.
- Instead of one 'Item' table you got two distinct 'container_item' and 
'folder_item' tables.

So, this is not the best solution ... :(
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