Transmogrify.print

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- Stop multiple prints for multiple keys
[djowett]

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

- Fix entry point, now targetting ``transmogrify``
[aclark]

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

- Note the existence of ``collective.transmogrifier.sections.logger`` which does
something similar.
[aclark]

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- Fix blueprint name, should be something unique like ``transmogrify.print``
(instead of ``print``).
[aclark]

- Show ``keys`` being used in README
[aclark]

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- Fix package data, setup.py missing ``include_package_data``.
[aclark]

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- Initial release
[aclark]