serverspec/serverspec — pull request #465 by mizzy (2014-08-10 11:28:54+00:00)
Title: Remove return_* matcher of command resource

These are obsoleted.

```ruby
describe command('foo') do
it { should return_stdout /stdout/ }
it { should return_stderr /stderr/ }
it { should return_exit_status 0 }
end
```

Instead, you can write like these.

```ruby
describe command('foo') do
its(:stdout) { should match /stdout/ }
its(:stderr) { should match /stderr/ }
its(:exit_status) { should eq 0 }
end
```