Update Ember to 1.5.0 and Ember resolver and handlebars to 1.3.0

no related issue
Merge pull request #2564 from hswolff/ember-upgrade

Update Ember to 1.5.0 and Ember resolver and handlebars to 1.3.0
Implement Notifications for Ember

closes #2417
- Adds Notification(s)Component
- Render notifications in application.hbs
- Adds handleError in application route