[Distutils] PEP 503 - Simple Repository API

[Donald Stufft]

I've updated the PEP with the typo corrections, clarifications, and the missing
GPG signature support that Marc-Andre and Marius pointed out. It should be live
on the PEP site soon, but the diff can be viewed online at
https://hg.python.org/peps/rev/a314911efa10

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Donald Stufft
PGP: 0x6E3CBCE93372DCFA // 7C6B 7C5D 5E2B 6356 A926 F04F 6E3C BCE9 3372 DCFA