Ember 1.0.0 and Ember Data 1.0.0-beta.1

This updates the ember version of todomvc to the latest ember, version 1.0.0, and the latest ember data, version 1.0.0-beta.1.  The code here is updated to use new ember 1.0 style and idioms as much as possible, and also to match the "[Getting Started](http://emberjs.com/guides/getting-started/)" official ember guide, which walks the reader through creating a todo app essentially the same as the one here.

 * bindAttr, linkTo -> bind-attr, link-to
 * quotes around strings (i.e., route names), no quotes around bound properties, in handlebars templates
 * use `actions:` hash in controllers for actions
 * Change names to more closely mirror the "getting started" guide at emberjs.com
 * Add insert element lifecycle hooks by using `.on('didInsertElement')`
 * Remove class name bound to nonexistent `buttonClass` property
 * Change order of getter and setter in allAreDone to match getting started guide
 * Use an outlet in 'todos' template and add 'todos/index' template.
 * Remove 'text-cleared' custom view action to match "Getting Started" guide
 * `isCompleted` property saves model when used as a setter
 * `allAreDone` property saves changes when used as a setter