[BUGFIX] RubySpeech::NLSML documents are built as a structured object now

See https://github.com/benlangfeld/ruby_speech/issues/22
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Fix the build

Something in the switch to expect() syntax has caused #should not to be defined on all objects, leaving this to be called as a method on the actor. Once these call actors are dead, however, they can't respond to this. We need to explicitly look at #alive?

Also see https://github.com/adhearsion/adhearsion/commit/11346121832ce2b3d92fb41784bbc5baaa01418a

This is pending an upgrade to RSpec 3.x
Convert specs to RSpec 2.14.8 syntax with Transpec

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

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

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

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

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

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

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

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

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

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

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

* 1 conversion
    from: collection.should have(n).items
      to: expect(collection.size).to eq(n)

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

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