Plone-folder

------------------

- Whitespace cleanup, git ignores, cleanup package info.
[gforcada, rnixx, maurits]

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- Allow reversing the current order, without specifying a key for
sorting.
[maurits]

- Allow ordering by a method instead of an attribute.
[maurits]

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- Update manifest.in to fix packaging error.
[esteele]

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- In setup.py, name more dependencies explicitly.
[thet]

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- Update notifyContainerModified import location.
[hannosch]

- Add MANIFEST.in.
[WouterVH]

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- Added objectValues and objectItems method to the ordered folder
implementation, which use objectIds and thus the ordering information. In
Zope 2.13 BTreeFolder2 was optimized to loop over the internal _tree data
structure avoiding the objectIds indirection.
[hannosch]