mizzy/serverspec — pull request #59 by sho-h (2013-04-20 13:30:26+00:00)
Title: fix belong_to_group to match groups(currently, matches only primary group)

belong_to_group matcher can check primary group in my env.
(gid=xxx(name) was printed by awk in this command)

```
$ id #{user} | awk '{print $2}' | grep #{group}
```

I want to check all group belongs_to subject user.

please merge this request if you want too.