transport.sendmail: Use subprocess instead of os.Popen
Prevent quopri-encoding the Date header.
Fixed typo in README
Fixed traceback with debugging logger
The Date header was ending up like this: Date: =?utf-8?q?Sat=2C_01_Sep_2012_13=3A08=3A29_-0300?= I was opening the received message in Thunderbird, using my gmail account over IMAP and the date was not being read correctly (not sure if this is Thunderbird's fault) and the message would appear as if it were from 1969... Anyway, the problem goes away if this header is pre-converted to a bytestring. I don't think there is ever anything other than ASCII in this header anyway. Thoughts welcome...
… tested, and documented; resolves #30.
…d "manager" directives.
…ports; fixes #31.
…ed bug in the validation tests.
…heating; fixes #26.