Finish Debug screen for Ember admin

Closes #2847
Merge pull request #3091 from jaswilli/debug

Finish Debug screen for Ember admin
Allow tabbing responsive editor when not on mobile.

fixes #3095
- Add `click` event to floatingheader
Merge pull request #3098 from halfdan/3095-non-mobile-tabbing

Allow tabbing responsive editor when not on mobile.
Stay on posts.index route when no posts exist

No Issue
Merge pull request #3104 from jaswilli/route-undefined

Stay on posts.index route when no posts exist
Add off as a noop function to touch editor.

Closes #3107
Merge pull request #3108 from novaugust/touch-editor-off

Add off as a noop function to touch editor.
Update Ghost-UI version to 0.8.1

References #3102 #2491
Merge pull request #3116 from PaulAdamDavis/master

Update Ghost-UI version to 0.8.1
New setup screen for blog installation.

fixes #3072
- Change router to handle /ember/setup/
- Adjust doSignup to also handle setup
- Adjust tests and add new where necessary
- Add setup controller, setup validation, setup route
- Adjust casper emberSetup to handle new setup
Merge pull request #3102 from halfdan/3072-setup-screen

New setup screen for blog installation.
Switching the tests to use ember admin by default

ref #3060

- Some of our tests use the old signin/signout as part of the setup/teardown process. The old stuff is going away, so this PR switches everything over to use the new admin by default.
- There wil be a further PR to remove the old stuff completely soon.
Merge pull request #3117 from ErisDS/switch-tests

Switching the tests to use ember admin by default