Further UTF8/MIME fixes for the commitfest app

Hi Magnus,

Thanks for the quick fix for the email From header bug yesterday. I
haven't had a chance to test it yet, because I don't want to pollute the
mailing list with test messages.

Please find attached two more patches:

#1 applies the same fix when Cc-ing patch authors
#2 MIME-decodes headers received from the mailing list archive JSON API

I haven't been able to talk to the JSON api, so I couldn't test them
properly, but I did some stand-alone testing of the code snippets.

Note that the MIME decoding only works properly if running under Python
3; the Python 2 version of email.header.decode_header() has broken
detection of the end of encoded-words.

Thanks,

ilmari

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