Update to Ember 1.9.0.

No Issue
- Ember@1.9.0
- Handlebars@2.0.0
- grunt-ember-templates@0.5.0-alpha
Prevent publish-bar from floating up
Merge pull request #4526 from knownasilya/patch-1

Prevent publish-bar from floating up on mobile
stop middleware converting favicon to string

closes #4658

- adds conditional to prevent favicon being processed as a string
Merge pull request #4661 from cobbspur/favicon

stop middleware converting favicon to string
Merge pull request #4620 from jaswilli/ember19

Update to Ember 1.9.0.
Tag Management: Delete Flow

Closes #4633
- The ‘delete’ button is now a smaller plain text link, opening a
confirmation modal analog to the delete user/post flow
- Adding a post count is dependent on #4654, but the modal is already a
neat step up from the immediate, warning-less deletion.
Merge pull request #4656 from felixrieseberg/iss4633

Tag Management: Delete Flow
Merge branch 'master' of https://github.com/TryGhost/Ghost

Conflicts:
	core/client/controllers/settings/tags.js
	core/client/templates/settings/tags/settings-menu.hbs