Small refactoring for maximum Ruby experience :heart: :tada:

Refactorings include:

- Instead of explicit return values of true/false in #match_government_domain?, prefer a more idiomatic use of ||.
- Use File.expand_path in #domains instead of File.dirname + path.
- Remove explicit returns in #is_government? where not needed.
Merge pull request #1 from parkr/patch-1

Small refactoring for maximum Ruby experience :heart: :tada: