Convert specs to RSpec 2.99.1 syntax with Transpec

This conversion is done by Transpec 2.3.6 with the following command:
    transpec

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

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

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

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

* 71 conversions
    from: be_true
      to: be_truthy

* 66 conversions
    from: be_false
      to: be_falsey

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

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

* 18 conversions
    from: describe 'some controller' { }
      to: describe 'some controller', :type => :controller { }

* 17 conversions
    from: Klass.any_instance.stub(:message)
      to: allow_any_instance_of(Klass).to receive(:message)

* 16 conversions
    from: describe 'some model' { }
      to: describe 'some model', :type => :model { }

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

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

* 8 conversions
    from: describe 'some view' { }
      to: describe 'some view', :type => :view { }

* 3 conversions
    from: describe 'some helper' { }
      to: describe 'some helper', :type => :helper { }

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