added exception for hash rockets in rubocop

This will stop rubocop from complaining about the hash rockets in resources/templates (such as supports, example below):

```
user "zack" do
  shell node[:rackspace_user][:users]["#{user}"][:shell]
  home node[:rackspace_user][:users]["#{user}"][:home]
  comment node[:rackspace_user][:users]["#{user}"][:note]
  supports :manage_home => false
  action :create
end
```

^ On the 'supports' line - it was complaining that I should use the newer Ruby 1.9 syntax. Trying to use the new Ruby 1.9 syntax caused further errors/ugliness. Worked with Tom on this - we both thing ignoring this is much more legible and logical. Thoughts?