1. Use batch params on batch_iterate_users_with_notifications method
2. Set send_notifications_to_users to use batch size of 100
Try more rubies
No more 1.9.2
1. Create notifications_buffered_sender.rb and associated tests
2. Refactor Service to use new NotificationsBufferedSender class
1. Remove Notifications Generator. No longer used. Also removed associated test
2. Add #sendable(type) instance method to notifications to make it spit out a readily usable notification for ios and android
3. Add tests for 2
1. Overrride #==(that) for GCM and APN notifications in spec_helper so that we can do 2.
2. Add test to make sure that notifications are being sent properly
Lower #sendable complexity