Improve web calendar detection
Various bug reports appeared regarding adding Web-based calendars. Namely:
Helmut Grohne wrote: "If you navigate to http://events.linuxfoundation.org/events/archive/2013/embedded-linux-conference-europe-/program/schedule, you can see a conference schedule in ics format at the bottom. The actual calendar link to be added to a program like gnome-calendar is http://embeddedlinuxconferenceeu2013.sched.com/all.ics. Note that these calendars typically are not meant to be downloaded once and then used, but updated periodically (but still read-only from the pov of the consumer)."
Jose wrote: "At work we have an Exchange server which I access through Davmail. I'm trying to substitute Thunderbird with Geary and Gnome Calendar however, when I add the calendar through the CalDav URL in the format http://localhost:1080/users/mail@company.com/calendar I get a list of Calendars which I select. Then I expect to see the calendar events as I see them in Thunderbird however that's not the case and the Calendar view is empty."
Many other individuals also reported the same on IRC. I'm centralizing all this knowledge in a single bug, so we can track and fix those issues quicker.
Link to original bug (#781421)
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