closes#2906
- add a utility function to add classnames to targets, retrofitted from clientold to accommodate `Ember.run.bind`
- create a content-preview view that tracks its scrolling
- add a scroll handler to the existing PostsListView
- The `posts/post` template now takes its HTML from the post model instead of using the editor's markdown component
no issue
- this ports over screens from old admin to
allow people to begin working on aspects of the screen
- All logged out screens have been imported: Signup, Signin,
Forgotten password, reset password
- Those screens are now ready for behavior to be ported over
- This also updates templates to be more in line with how they were
in the old admin
- Littered through the code are @TODO comments of functionality that is
missing and will need to be resolved before this is production ready
- Also scaffolds out the settings screen and every tab
