Add setup.cfg and CONTRIBUTING.md

See http://hynek.me/articles/sharing-your-labor-of-love-pypi-quick-and-dirty/

CONTRIBUTING.md

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+# How To Contribute
+
+sigal is always open for suggestions and contributions by generous developers.
+Here are a few tipps to get you started.
+
+Please:
+
+- Obey [PEP 8] and [PEP 257].
+- *Always* add tests and docs for your code.
+- Add yourself to the AUTHORS file in an alphabetical fashion.
+- Write [good commit messages].
+- Ideally, [squash] your commits, i.e. make your pull requests just one commit.
+
+Thank you for considering to contribute to sigal !
+
+
+[squash]: http://gitready.com/advanced/2009/02/10/squashing-commits-with-rebase.html
+[PEP 8]: http://www.python.org/dev/peps/pep-0008/
+[PEP 257]: http://www.python.org/dev/peps/pep-0257/
+[good commit messages]: http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html

setup.cfg

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+[wheel]
+universal = 1