release v0.3.0 (2015-09-09)

• Install tar package.
• Update chef links to use chef.io domain.
• Update contact information and links after migration.
• metadata: Add source_url and issues_url links.
• Remove Fedora and RedHat support.
• Documentation:
  • Move ChefSpec matchers documentation to the README.
  • README:
  • Improve title and description.
  • Add GitHub badge.
• Testing:
  • Test files updates: Berksfile, Gemfile, Guardfile, Rakefile, RuboCop 0.34.0.
  • Move ChefSpec tests to test/unit.
  • Travis CI: Run tests against Chef 11 and Chef 12.
  • .kitchen.yml: Update platform versions.
  • Use runit cookbook 1.6.0 to avoid issue hw-cookbooks/runit#142.