Modified spec and its failure message

spec_and_failure

code: 
```
it 'should print an object reference' do
  puts SelectiveRelease::Homework.quizzes.quiz_for_everyone
end
```

Failures:

  1) Viewing a selective release quiz as the teacher on the assignments index page shows all the quizzes
     Failure/Error: puts SelectiveRelease::Homework.quizzes.quiz_for_everyone
     NameError:
       undefined method `assignment_id=' for module `#<Module:0x007ff5cc5e3f98>'
       Did you mean?  assignment_quiz
                      assignment_model
     # ./spec/selenium/quizzes/quizzes_selective_release_spec.rb:22:in `puts'
     # ./spec/selenium/quizzes/quizzes_selective_release_spec.rb:22:in `puts'
     # ./spec/selenium/quizzes/quizzes_selective_release_spec.rb:22:in `block (4 levels) in <top (required)>'
     # ./spec/selenium/common.rb:82:in `block (2 levels) in <top (required)>'
     # ./spec/spec_helper.rb:34:in `block (3 levels) in <top (required)>'
     # ./spec/spec_helper.rb:32:in `block (2 levels) in <top (required)>'
     # -e:1:in `<main>'