Add license file.

Standard for new gems.
Travis.

Add travis with build status in readme, also shorten suffix for readme.
Version file master for Spree 2.0
Swedish locale.
Routes code formatting.
Migrations code formatting.
Yaml lint locales.
Refactor migrations.
Refactor specs.
Refactor engine and gemspec.
Refactor views.
Refactor overrides.
Refactor models and controller.
Deleted unused view.
Add model order decorator.