Replace the old admin with the ember admin

closes #3056

- Remove clientold
- Remove clientold tests
- Cleanup old admin helpers
- Remove old routes from admin and controllers from admin controller
- Comment out / remove old and broken tests
- Cleanup Gruntfile.js, bower.js, package.json etc

Still TODO:

- cleanup / add removed tests
- do we still need countable?

ghost/admin/README.md

@@ -1,13 +0,0 @@
-## What's this?
-
-This is the shiny new Ghost admin UI built in Ember.js. It gets served if you visit the URL `/ghost/ember/`.
-
-We're currently in the process of building this awesome new UI to replace the old one which was written in backbone,
-lives in the `/clientold/` folder and is still served when you visit the URL `/ghost/`.
-
-In short, we currently have 2 admins:
-
-* Old, Backbone Admin UI lives in `/clientold/` and is served from `/ghost/`
-* New, Ember Admin UI lives in `/client/` and is served from `/ghost/ember/`
-
-For more information, please read the [Ember admin wiki page](https://github.com/TryGhost/Ghost/wiki/Ember-Admin-UI)

ghost/admin/router.js

@@ -6,7 +6,7 @@ var Router = Ember.Router.extend();
 
 Router.reopen({
     location: 'trailing-history', // use HTML5 History API instead of hash-tag based URLs
-    rootURL: ghostPaths().subdir + '/ghost/ember/', // admin interface lives under sub-directory /ghost
+    rootURL: ghostPaths().subdir + '/ghost/', // admin interface lives under sub-directory /ghost
 
     clearNotifications: function () {
         // @TODO This should call closePassive() to only close passive notifications