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
oAuth

closes #2759
closes #3027

- added oauth2orize library for server side oAuth handling
- added ember-simple-auth library for admin oAuth handling
- added tables for client, accesstoken and refreshtoken
- implemented RFC6749 4.3 Ressouce Owner Password Credentials Grant
- updated api tests with oAuth
- removed session, authentication is now token based

Known issues:
- Restore spam prevention #3128
- Signin after Signup #3125
- Signin validation #3125