move webcal to webcals

[Trott]

Someone may want to test to verify this, but it appears that webcal URIs initiate requests over HTTP, which means the authentication token will be sent in the clear initially. We should change the URIs to webcals (note trailing s) and then test.

[Trott]

/cc @elliotkendallUCSF (although I guess anyone of us can probably do a find/replace on the string webcal).

[Trott]

Ooooof... huge bummer. Google calendar does not appear to support webcals as a protocol.

Although just adding the calendar with https URL seems to work just fine. Any reason we shouldn't just do that?

[elliotkendallUCSF]

Unless there's another calendar client we want to support that we know doesn't handle https URLs, I think that's the way to go.

[stopfstedt]

Subscribed to a calendar feed from ilios-stage over https:// with Google Calendar, Outlook 2007 and on an iTouch/iOS7.
Good enough for me.

[stopfstedt]

merged #349