Convert specs to RSpec expect syntax with transpec

One failing test still (though, it's a different failing test than the existing test suite).

This conversion is done by Transpec 1.13.1 with the following command:
    transpec

* 76 conversions
    from: obj.should
      to: expect(obj).to

* 25 conversions
    from: == expected
      to: eq(expected)

* 7 conversions
    from: obj.should_not
      to: expect(obj).not_to

* 4 conversions
    from: =~ /pattern/
      to: match(/pattern/)