Follow redirects (up to 3 deep) when pulling calendar feeds
Hotfix to skip venues that have titles > 255 chars

It currently breaks at the database level when strings are too long.
Don't create new events or venues during import if explicitly deleted
Display first 3 days of multi-week events instead of just dropping them
Merge branch 'prod-hotfix'
Prototype interface for drag & drop based event de-duplication
Merge branch 'manage_overlay_proto'
Allow > 3 link in event desc if it already exists w/ > 3 links
Remove :dependent => :destroy for assocations that should persist

It's way too dangerous to cascade deletions when sources are destroyed;
it removes all the events and venues from the calendar, which is unexpected
behavior and and makes rolling back really painful.

Also removing :dependent => :nullify, as it does not trigger any callbacks
and thus create any entries in PaperTrail to allow rolling back.  The code
base appears unaffected by the change.  WHEN we have support for rolling
back changes in bulk, and across multiple models, we might look at
restoring behavior similar to :dependent => :nullify.
Update rails version, minor changes to make 'bundle-audit' pass