Patch by Myk Melez <myk@mozilla.org>.
r=bbaetz,kiko

Patch by Brad Baetz <bbaetz@student.usyd.edu.au>
r= jake, justdave

r=dkl r=justdave

Users should only be able to view attachments if they can view the bug that the file is attached to (bug 70189)
r=tara

Don't put the filename in the content-type field; it's apparently not legal MIME for some content-types.

turned on): target_milestone, qa_contact, and status_whiteboard.