Remove unused var :put_litter_in_its_place:
Refactoring valiable: camelCase :dromedary_camel: -> snake_case :snake:
Cosmetic change
Refactor: extract to notification.js
move to new background
Modify: codeclimate
Merge pull request #23 from sue445/issues/18_refactoring

Issues/18 refactoring close #18