Fix DST drift in occurrence generation

- Occurrence.generate_dates: use ChaosCalendar::occurrences_for_timezone
  with Time.zone.tzinfo.identifier — occurrences now keep wall-clock
  time across DST boundaries (19:00 stays 19:00 in summer and winter);
  requires chaoscalendar gem with occurrences_for_timezone support
  (Gemfile.lock bumped accordingly)
- Occurrence.find_in_range: joins(:event) inner join excludes occurrences
  whose event no longer exists (107k orphaned rows from the pre-revival
  calendar era were purged from the test DB); includes(:node) retained
  for eager loading; column references qualified with table name

1 files changed, 1 insertions, 1 deletions

diff --git a/Gemfile.lock b/Gemfile.lock
index b5c5c77..2e9a1ce 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,7 +8,7 @@ GIT
 
 GIT
   remote: https://github.com/erdgeist/chaoscalendar.git
-  revision: 3c0b34dd260f11d15378a6255d9862d629c8413a
+  revision: 48fe5c517ae3895cc78d9d2fefbdd35b90d52ba7
   branch: erdgeist-ruby1.9
   specs:
     chaos_calendar (0.1.3)