Convert specs to RSpec 2.14.8 syntax with Transpec

This conversion is done by Transpec 1.10.4 with the following command:
    transpec spec/models/permitted_params_spec.rb

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

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

* 1 conversion
    from: obj.should_receive(:message)
      to: expect(obj).to receive(:message)