Vendoring six for Py2/3 compat.

Closed Bitbucket Importer requested to merge bitbucket/declined-pr-319 into branch/default

Created originally on Bitbucket by vanl (Van Lindberg)

Changesets for this Pull Request have not been imported, because it had been already declined on Bitbucket. Marked as closed by the import user.

Trying again. Separated everything out, resending to default.

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