This commit modernizes the cookbook in a number of ways

- Pass rubocop
- Pass foodcritic
- Convert from minitest-chef-handler to Serverspec
- Update the Kitchen configuration

More detail is provided to summarize the changes:

- Use chef_zero because this cookbook supports data bags and that is
  easier to support tests with zero than with solo
- Update the platform versions to current releases (centos 5.11/6.6/7.1
  debian 7.8, ubuntu 14.04)
- Add fedora-21
- Remove EOL unsupported platform versions (ubuntu 10.04, 13.04)
- Move attribute setting from dnsmasq_test recipe to kitchen config
- Update supermarket source in Berksfile
- Use single quotes for attribute keys instead of double quotes or symbols
- Remove long description from metadata because it's not needed for
  anything and reads in the entire readme
- Add rubocop configuration to ignore hash rockets and line length
- Resolve several findings for Rubocop
- Use inline if statements for recipe inclusion
- Ignore FC023, because we don't want to have the resource in the
  collection if tftp-root isn't enabled, use an inline conditional to
  make the resource in column 0
- Include the config recipes because otherwise they can't fix a config
  problem before chef attempts to start dnsmasq service
- use "resource_type[resource_name]" syntax for resource lookup in notifications
- remove apt cookbook from berks and kitchen, and use execute resource
  in dnsmasq_test recipe
- Add tests for listening ports 53, 67, and 69

We're no longer using minitest-handler, and the hosts_file cookbook is a dependency of dnsmasq so it will get picked up via `metadata`.

- Add a Gemfile
- Remove driver_config, kitchen-vagrant 0.18 via bundler, or chefdk
  0.5.1 is expected