Rework for rspec3.
Convert specs to RSpec 2.99.0 syntax with Transpec

This conversion is done by Transpec 2.2.1 with the following command:
    transpec -c rake spec

* 17 conversions
    from: obj.should
      to: expect(obj).to

* 15 conversions
    from: == expected
      to: eq(expected)

* 2 conversions
    from: be_false
      to: be_falsey

* 1 conversion
    from: be_true
      to: be_truthy

* 1 conversion
    from: it { should ... }
      to: it { is_expected.to ... }

* 1 conversion
    from: obj.should_not
      to: expect(obj).not_to

For more details: https://github.com/yujinakayama/transpec#supported-conversions