Add option to accept self signed certs from caldav server
My caldav server is on https with a self signed cert, by default the caldav driver would not connect to it.
I've worked around this by going to plugins/calendar/lib/SabreDAV/lib/Sabre/DAV/Client.php and adding: $curlSettings[CURLOPT_SSL_VERIFYPEER] = 0; at line 331
It would be great to have an option when creating the calendar in the ui for the verifyPeer setting passed to the SabreDAV Client constructor.