Add :sv locale.
Removed empty routes.
Add full test suite.
Add contributing document.

This hooks into Github’s Issue header in a very nice way.
Renamed :pt locale to follow Rails i18n pattern.
Updated documentation.
Backported :sv locale for v1.1
Add RVM 1.8.7 to Travis.
Backported Guardfile's hash syntax.
Backported engine and spec for Spree v1.1