Update README code examples
Bump version to 1.3.0

  * Automatically localize via `I18n.locale` and the `countries` gem
  * Add support for `locale` option in `country_select` helper
Store config directly in `Thread.current` key
Update appraisal gemfiles
Merge pull request #46 from scudco/1.3.0-release-prep

[WIP] 1.3.0 release prep