Merge pull request #14 from pronix/2-0-stable

Enable settings for admin UI.
Cleanup.

- Use single quotes.
- Remove whitespace etc.
- Use v1.0.1 for database cleaner, new version is for rails4 i think.
Merge branch '2-0-stable' of github.com:futhr/spree-klarna into 2-0-stable
fix update for klarna settings
fix test for correct settings logic
close #15. Klarna config seetting moved to payment_methods preferences