mikel/mail — pull request #389 by djmaze (2012-04-30 13:31:51+00:00)
Title: Mail parts should have no "Date" or "Mime-Version" headers.

Fixes attachments not shown in Outlook 10.

Includes specs. Tested on ree-1.8.7-2011.03 and ruby-1.9.2-p180.