remove unused buttonClass:hidden
use .on('didInsertElement') in view
Remove 'text-cleared' sent action from EditTodoView, move auto-removal functionality into TodoController. Use debounce to prevent multiple calls to `removeTodo`
Save todo automatically when completed changed.
Save the todo in the `createTodo` action of TodosController
Per the TodoMVC spec, cancel changes to a todo when escape is pressed.