Collective.monkeypatcher

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Fixes:

- Use zope.interface decorator.
[gforcada]

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- Fix typo.
[gforcada]

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* Fix the case where the replacement object does not have a __module__
attribute (see https://github.com/plone/collective.monkeypatcher/pull/3).
[mitchellrj, fRiSi]

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* Downgrade standard log message to debug level.
[hannosch]

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* Avoid a zope.app dependency.
[hannosch]

* Added new parameter preconditions that only patches if preconditions are met
like version of a specific package.
[spamsch]

* Added new parameter preserveOriginal. Setting this to true makes it possible
to access the patched method via _old_``name of patched method``
[spamsch]

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* Add the possibility to ignore the error if the original function isn't
present on the class/module being patched
[jfroche]

* Check if the docstring exists before changing it
[jfroche]

* Add buildout.cfg for test & test coverage
[jfroche]