Update for Ember 1.0.0

I've updated to the the following packages and their dependencies. Tests pass and running the generator works and generates an app. Everything is working the way it was before with the added bonus of Ember.js 1.0.0

Here's what's been changed

* Ember.js 1.0.0
* Handlebars.js 1.0.0
* Ember Data 1.0.0 beta 1
* grunt-ember-templates 0.4.12 (works with Handlebars 1.0.0)