Plone-behavior

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Fixes:

- Make doctest comparison more robust against zope.component __repr__ changes.
[thet]

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

- Corrected typo in warning.
[jensens]

- Add name to behavior directive. This name can be used to lookup behavior
registrations by new plone.behaviors.registration.
lookup_behavior_registration function.
[rnixx]

- Added more documentation, simplified code in directive, added a warning if
``for`` is given w/o ``factory``.
[jensens]

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- Code modernization: utf-header, pep8, rst-files, adapter/implementer
decorators, ...
[jensens]

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- Remove dependence of tests on zope.app.testing.
[davisagli]

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- Relicense under BSD license.
See http://plone.org/foundation/materials/foundation-resolutions/plone-framework-components-relicensing-policy
[davisagli]

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- Use stdlib doctest instead of the deprecated one in zope.testing.
[davisagli]

- 'plone:behavior' zcml directive use now MessageID for title and description.
[sylvainb]