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?
Merge pull request #3165 from ErisDS/issue-3056

Replace the old admin with the ember admin