Z3c.dependencychecker

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- Documentation updates because we moved to github:
https://github.com/reinout/z3c.dependencychecker .

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- Added fix for standard library detection on OSX when using the python
buildout. (Patch by Jonas Baumann, as is the next item).

- Supporting ``[tests]`` in addition to ``[test]`` for test requirements.

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- Looking for a package directory named after the package name in preference
to the src/ directory.

- Compensating for django-style 'django-something' package names with
'django_something' package directories. Dash versus underscore.

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- Zcml files are also searched for 'component=' patterns as that can be used
by securitypolicy declarations.

- Dependencychecker is now case insensitive as pypi is too.

- Using optparse for parsing commandline now. Added --help and --version.

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- Documentation update.

- Improved test coverage. The dependencychecker module self is at 100%, the
original import checker module is at 91% coverage.

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- Searching in doctests (.py, .txt, .rst) for imports, too. Regex-based by
necessity, but it seems to catch what I can test it with.