* Add last_active_at datetime to Broadcasts table
* Add last_active_at to Broadcast index view
* Add callback to Broadcast.rb to update last_active_at
* Add a data_update script to backfill the last_active_at column on the Broadcasts table
* Add a spec for updating the last_active_at timestamp in models/broadcast_spec.rb
* Format last_active_at timestamp via strftime in index.html.erb
* Remove data_update_script: backfill_last_active_at_for_broadcasts
* Remove ActiveRecord::Dirty method from broadcast.rb
* Adjust callback in broadcast.rb and last_active_at timestamp format in index.html.erb
* Adjust time in #update_last_active_at and add the safe navigation operator to index.html.erb
* Accounts for nil last_active_at values in the view
* Uses Time.current in place of Time.zone.now
* Remove last_active_at param from Broadcasts::Controller
* Add spec to broadcasts_spec.rb to test the updated attribute via a request
* Adjust current_time in broadcasts_spec.rb
* Adjust Timecop.freeze in broadcasts_spec.rb to resolve Travis faliure (fingers crossed)
* Adjust expectation to compare against last_active_at timestamp rather than current time
* Adds Timecop back and stores last_active_at timestamp to test against
* Rename last_active_at to active_status_updated_at on Broadcasts table
- Renames last_active_at to active_status_updated_at in specs
- Renames last_active_at to active_status_updated_at in model
- Renames last_active_at to active_status_updated_at in view
- Adjusts spelling in spec descriptions
- Rewords active_status_updated_at in view to Last Active On
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