evert/sabre-vobject — pull request #20 by mtorromeo (2013-01-29 10:23:13+00:00)
Title: Escape , and ; from property values as per RFC2445

The RFC specifies that \, \n, ; and , are all characters to be escaped from icalendar values
See here http://tools.ietf.org/html/draft-ietf-calsify-rfc2445bis-08#section-3.3.11

Thanks