Allow exporting meetings as a iCal calendar feed

[mitar]

So that you could add all meetings to your calendar.

[arcalinea]

Or option to add to google calendar?

[mitar]

If it is unclear, by iCal I meant iCalendar standard to describe calendar events, not Apple iCal app. You can add iCal calendar feed to a Gogle Calendar. So what I think it is better to provide for now a standard format to do that. But yes, later on we could maybe integrate with Google Calendar as well (especially if user links their Google account with PeerMind, so we could even ask for permissions to automatically add events to their calendar).