Fix license string in gemspec + ship gemspec / readme
Fix license string in gemspec + ship gemspec / readme

More tweaks to the gemspec to ship the necessary files for ChefDK

Signed-off-by: Tim Smith <764ef62106582a09ed09dfa0b6bff7c05fd7d1e4@chef.io>

Nordstrom/chef-vault,chef/chef-vault,chef/chef-vault