Resume work status list

- Added work status API
- Added tests
I'd break this up into multiple smaller tests, possibly like this. Also, prefer `expect` over `should`, and I find it odd you compared classes the way you did...
``` ruby
describe 'The model objects it instantiates' do
  let(:models) { Responses::WorkStatus::List.new(json_hash).models }
  let(:translations) { models[0].translations }

  it { expect(models.length).to eq 1 }
  it { expect(models[0]).to be_a Cb::Models::WorkStatus }
  it { expect(models[0].key).to eq 'CTCT' }

  it { expect(translations.length).to eq 3 }

  it { expect(translations[0]).to be_a Cb::Models::WorkStatus::Translation }
  it { expect(translations[1]).to be_a Cb::Models::WorkStatus::Translation }
  it { expect(translations[2]).to be_a Cb::Models::WorkStatus::Translation }

  it { expect(translations[0].language).to eq 'French' }
  it { expect(translations[0].value).to eq 'Citoyen' }

  it { expect(translations[1].language).to eq 'Dutch' }
  it { expect(translations[1].value).to eq 'Inwoner' }

  it { expect(translations[2].language).to eq 'English' }
  it { expect(translations[2].value).to eq 'US Citizen' }
end
```