Convert specs to RSpec expect syntax with transpec

This conversion is done by Transpec 1.13.1 with the following command:
    transpec

* 69 conversions
    from: obj.should_receive(:message)
      to: expect(obj).to receive(:message)

* 12 conversions
    from: expect(collection).to have(n).items
      to: expect(collection.size).to eq(n)

* 2 conversions
    from: stub('something')
      to: double('something')

* 1 conversion
    from: obj.stub(:message)
      to: allow(obj).to receive(:message)