changed email format

Since I'm using mutt more often for mail, I figured I would get rid of
the multi-part email message, ditching HTML formatting for something
that makes more sense for plain text.

The new format is:

Date:       2013-08-15
Title:      Global eBusiness Leader
Location:   hercules, pinole, san pablo, el sob
URL:        http://sfbay.craigslist.org/eby/sad/4003852340.html
Keywords:   research[3]