Daylight Savigns Timezone (DST) Bug Fix

- Added code to adjust to DST. Before if not in DST, the time is off by
  3600 seconds (1hr).
- Added 5 test cases to the 'events' database to test the different
  scenarios (i.e. before DST, transition to DST, during DST, transition
  from DST, after DST).
- event.test.php: sets and tests different timezones (i.e.
  'America/Regina' doesn't have DST, 'America/Vancouver' has DST)