Pyramid-royal

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- Permit method override for GET.

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- Make DELETE method return 204 No Content

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- Make dummy testing resources derive from dict.

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- Fix ``royal.testing``.

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- Breaking change: Remove ``.parent`` and ``children`` property on
``royal.resource.Base``
- Add ``find_item`` and ``find_collection``
- Update interfaces.

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- Fix a bug with 2 items being adjacent in hierarchy. The child item was not
registered on the good parent.
- Add a default implementation in sqla extension for ``Item.replace``.