Collective-stats

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- Nothing changed yet.

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- Provide a way to still have the functionality, without logging
[frapell]

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- Fixes ``AttributeError`` with ``thread._local``, adapt to new ``psutil`` API.
Ref: http://stackoverflow.com/questions/20640679
[thet]

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- Add stats info for plone.transformchain applyTransform
[fafhrd91]

- Add stats info to failure requests.
[fafhrd91]

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- Add output header detail to README
[aclark]

- Fix typo
[jean]

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- Fix docs
[aclark]