Issue #3160
- Use notifications API to display available update notification.
- Remove update_notification handlebars helper as now both the
check for an available update and the notification handling
is run from the server's admin controller index method.
- Bind the notification's location property to a css class
for styling.
- Refactor Ember notifications to better handle notification
objects. Move responsibility for css class generation onto
the notification component.
- Refactor gh-notifications component to take a location argument
that's used to assign a css class and filter notifications.
Closes#1558
- Adds a wrapping tag around the notification message
- Change tests to look for new wrapping tag
For the fix to work properly, it needs styles from the [0.8 branch](b98029911c) of Ghost-UI
