Prettyconf

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- Remove testfixtures requirements (it's broken with pypy)

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- New cast type: config.eval (uses ``ast.literal_eval`` to cast python settings)
- 3rd-party suggestion: dj-email-url parser in documentation

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- New cast type: config.tuple (converts a comma-separated string in tuple)

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- Ignore errors in ``make clean``

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- Fix a brown paper bug in the last release
- Force test running in ``make release`` target
- Add "pragma: no cover" in abstract methods

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- Skip discovering files inside not-directory paths (eg. ``.egg``, ``.zip``
or wheel packages)