Update ember-data to v1.0.0-beta.1
Update ember to v1.0.0
Update to idiomatic ember 1.0:

 * Only auto-save todo when isCompleted changes, not when title changes
 * 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 the todo in the `createTodo` action of TodosController
Per the TodoMVC spec, cancel changes to a todo when escape is pressed.