Often you need to create a feature with system variables to make them complete. Features itself does not provide this, but the Strongarm module does, and we'll see how to add that to the mix.
Exporting Settings Variables with Strongarm
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Additional resources:
Features project (Drupal.org)
Introduction to Drush Series (Drupalize.Me)
https://github.com/DrupalizeMe/drupalize-lullablog (GitHub.com)