.vimrc: Wrap at 72 for mutt
.offlineimaprc: Create mutt mailboxes config
.muttrc: Set my from address
.muttrc: Get mailbox names from offlineimap

Thanks, offlineimap! You're my best friend! :)
.muttrc: Bring back j/k nav, don't cache headers

j should go down, k up, one line, always.

Don't cache headers, I think this only applies to imap, I don't see a
speed difference on big mailboxes.