Added option to force use of SSLv3

Permit use of the specific SSL as a workaround for the openssl bug in
certain environments
(https://bugs.launchpad.net/ubuntu/+source/openssl/+bug/965371)
Fix to initialization issue when working against CalendarServer

DAV returns "403 Forbidden" on PROPFIND with "Depth: Infinity"
(default) header
Variable name typo fixed
Generalized handling of the 'getcontenttype' property

CalendarServer gives yet another variation for 'getcontenttype'
("text/vcard; charset=utf-8")