* VTIMEZONE blocks must be sent in our ics files for meeting
invitations that are recurring, as the originator's time zone
is critical in making attendee's calendars accurate
* Created a utility to convert TimeZone to VTIMEZONE data; the
utility successfully generates data (including recurrence rules)
for the entire tzinfo database (the source of TimeZone).
* Updated our ics files to include VTIMEZONE when appropriate and
send DTSTART/DTEND in local time in that case
* Wrote some unit tests, but more are needed
Change-Id: Iccbdd00cd3b2be2da058b344ebacd17ed6fb0e3d
4577f71f76