Convert specs to RSpec expect syntax with transpec

This conversion is done by Transpec 1.13.1 with the following command:
    transpec

* 24 conversions
    from: obj.should
      to: expect(obj).to

* 10 conversions
    from: its(:attr) { }
      to: describe '#attr' do subject { super().attr }; it { } end

* 9 conversions
    from: == expected
      to: eq(expected)

* 4 conversions
    from: collection.should have(n).items
      to: expect(collection.size).to eq(n)