Remove all the old acceptance tests.
Convert specs to RSpec 2.99.1 syntax with Transpec

This conversion is done by Transpec 2.3.1 with the following command:
    transpec -f -c "bundle exec rake spec"

* 82 conversions
    from: it { should ... }
      to: it { is_expected.to ... }

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

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

* 5 conversions
    from: its([:key]) { }
      to: describe '[:key]' do subject { super()[:key] }; it { } end

* 1 conversion
    from: it { should_not ... }
      to: it { is_expected.not_to ... }

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

For more details: https://github.com/yujinakayama/transpec#supported-conversions
Rework the acceptance and unit tests.
Merge pull request #449 from apenney/spec_tests_rewrite

Spec tests rewrite