Rails update to 4.2.4

Gemfile

Gemfile.lock

app/models/sent_notification.rb

app/workers/emails_on_push_worker.rb

bin/ci/upgrade.rb

bin/rails

bin/rake

bin/setup

bin/upgrade.rb

config/environment.rb

config/environments/development.rb

config/environments/production.rb

config/environments/test.rb

config/initializers/cookies_serializer.rb

config/initializers/default_url_options.rb

config/initializers/rack_attack.rb.example

config/initializers/rack_lineprof.rb

config/initializers/secret_token.rb

config/initializers/session_store.rb

config/initializers/sherlock.rb