Convert specs to RSpec 2.14.8 syntax with Transpec

This conversion is done by Transpec 2.3.1 with the following command:
    transpec

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

* 7 conversions
    from: =~ /pattern/
      to: match(/pattern/)

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

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

* 1 conversion
    from: obj.should_not
      to: expect(obj).not_to

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