Add new ScheduleUpdateUserActivityWorker and UpdateUserActivityWorker

app/workers/schedule_update_user_activity_worker.rb

app/workers/update_user_activity_worker.rb

...ve-last-activity-date-data-from-redis-to-the-database.yml

config/initializers/1_settings.rb

config/sidekiq_queues.yml

db/migrate/20170307125949_add_last_activity_on_to_users.rb

db/schema.rb

spec/workers/schedule_update_user_activity_worker_spec.rb

spec/workers/update_user_activity_worker_spec.rb