Use Add/Cancel buttons for adding a new schedule
Clean up of some issues

Encapsulate initialization code in schedule_form_controller.js
Refactor timer_option_service.js to not use quite as hard coded data
Refactor settings/schedules.rb to not use delete_if and DRY'd it a bit
Align hashes for readability in _schedule_form_filter.haml
Use %w for word array in _schedule_form_timer.haml