[CS] Convert specs to RSpec 2.99.1 syntax with Transpec

This conversion is done by Transpec 2.3.1 with the following command:
    transpec .

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

* 617 conversions
    from: obj.should_receive(:message)
      to: expect(obj).to receive(:message)

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

* 121 conversions
    from: be_true
      to: be_truthy

* 74 conversions
    from: be_false
      to: be_falsey

* 64 conversions
    from: obj.should_receive(:message).and_return { value }
      to: obj.should_receive(:message) { value }

* 53 conversions
    from: it { should ... }
      to: it { is_expected.to ... }

* 46 conversions
    from: its(:attr) { }
      to: describe '#attr' do subject { super().attr }; it { } end

* 42 conversions
    from: obj.should_not
      to: expect(obj).not_to

* 28 conversions
    from: lambda { }.should
      to: expect { }.to

* 27 conversions
    from: obj.stub(:message)
      to: allow(obj).to receive(:message)

* 9 conversions
    from: Klass.any_instance.should_receive(:message)
      to: expect_any_instance_of(Klass).to receive(:message)

* 9 conversions
    from: collection.should have(n).items
      to: expect(collection.size).to eq(n)

* 9 conversions
    from: lambda { }.should_not
      to: expect { }.not_to

* 6 conversions
    from: obj.stub!(:message)
      to: allow(obj).to receive(:message)

* 4 conversions
    from: obj.stub(:message).and_return { value }
      to: obj.stub(:message) { value }

* 3 conversions
    from: >= expected
      to: be >= expected

* 3 conversions
    from: pending
      to: skip

* 2 conversions
    from: it { should_not ... }
      to: it { is_expected.not_to ... }

* 1 conversion
    from: < expected
      to: be < expected

* 1 conversion
    from: > expected
      to: be > expected

* 1 conversion
    from: RSpec.configure { |c| c.color_enabled = something }
      to: RSpec.configure { |c| c.color = something }

* 1 conversion
    from: expect { }.not_to raise_error(SpecificErrorClass)
      to: expect { }.not_to raise_error

* 1 conversion
    from: it { should have(n).items }
      to: it 'has n elements' do expect(subject.size).to eq(n) end

For more details: https://github.com/yujinakayama/transpec#supported-conversions
[CS] Ensure we're free of RSpec deprecation warnings
[CS] Upgrade to RSpec 3

Fixes #497
[CS] Convert specs to RSpec 3.0.2 syntax with Transpec

This conversion is done by Transpec 2.3.1 with the following command:
    transpec .

* 76 conversions
    from: obj.stub(:message => value)
      to: allow(obj).to receive_messages(:message => value)

* 1 conversion
    from: Klass.any_instance.stub(:message => value)
      to: allow_any_instance_of(Klass).to receive_messages(:message => value)

For more details: https://github.com/yujinakayama/transpec#supported-conversions
[CS] Ensure we're totally RSpec deprecation warning free