[issue12345] Add math.tau

[Chi Hsuan Yen]

Chi Hsuan Yen added the comment:

>From http://tauday.com/

> No, really, pi is wrong...

For me it's a sign that pi is (currently) more common than tau. One purpose of the documentation is helping newcomers understand what Python's built-in objects mean. "tau = 2 * pi" is better than "pi = tau / 2" as those who know pi only are more than those who know tau only.

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<http://bugs.python.org/issue12345>
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