Added the method #all_translated(locale) that returns a list of translated country names.

- The returned list is only an array of country name strings
- The returned list is alphabetized in the translated language
- Countries that are missing locales are dropped from the list

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Revert "Added the method #all_translated(locale) that returns a list of translated country names."

This reverts commit c77cd4767bc07ce591fbb98374fa69e6f5ff0d50.
Added the method #all_translated(locale) that returns a list of translated country names.

- The returned list is only an array of country name strings
- The returned list is alphabetized in the translated language
- Countries that are missing locales are dropped from the list
Merge pull request #130 from LostTie/master

Added the method #all_translated(locale) that returns a list of translated country names.