letsencrypt/lets-encrypt-preview — pull request #92 by willoller (2014-11-28 05:30:24+00:00)
Title: acme/challenge_request handles only 1 domain name

No other functions inside acme/ handle lists, so
to keep the class consistent, challenge_request()
should only handle a string parameter. Iteration
should be moved to the client, which is handling
the list of domain names anyway.