To upstream

I can see that you been active again. So its time for me to push my changes upstream. I have squashed my old fork into a couple of commits so its easy to get an overview of changes. It has 93% test coverage so its pretty solid :moyai:.

I recommend you to move your current master into a `1-1-stable` branch (dunno really which Spree version your `master` branch supports) then apply this to `master`. It should be very easy to back-port this to any 2.x branch. A good Spree pattern now is to keep a branch for each stable version and keep master for edge.

I have initiated Code Climate for you, just Travis hook is missing for your original repo.

Changes:
- [x] Renamed `:pt` locale to follow Rails i18n pattern.
- [x] Add `:sv` locale.
- [x] Removed `Versionfile` (no longer used).
- [x] Removed untranslated locale `:fi` -you maybe would like to translate this ;)
- [x] Removed empty routes.
- [x] Refactor engine + calculator for Spree 2.x
- [x] Add full test suite now 93% coverage (from 0%).
- [x] Updated `README` + `LICENSE`.

I also bumbed this version to 2.2.0 so you may set lower numbers for back-ports.

@dancinglightning Cheers :beer: