Update specs to RSpec 2.14.8 syntax

[loganhasson]

This conversion is done by Transpec 1.13.1 with the following command: transpec

• 78 conversions from: obj.should to: expect(obj).to
• 52 conversions from: its(:attr) { } to: describe '#attr' do subject { super().attr }; it { } end
• 35 conversions from: == expected to: eq(expected)
• 8 conversions from: obj.should_not to: expect(obj).not_to
• 2 conversions from: it { should have(n).keys } to: it 'has n keys' do expect(subject.keys.size).to eq(n) end