Convert specs to RSpec 2.99.0 syntax with Transpec

This conversion is done by Transpec 2.2.0 with the following command:
    transpec

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

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

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

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

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

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

* 1 conversion
    from: == expected
      to: eq(expected)

See also: https://github.com/yujinakayama/transpec#supported-conversions