Update specs to RSpec 2.14.7 syntax

This conversion is done by Transpec 1.13.1 with the following command:
    transpec

* 112 conversions
    from: obj.should
      to: expect(obj).to

* 66 conversions
    from: == expected
      to: eq(expected)

* 12 conversions
    from: obj.should_receive(:message)
      to: expect(obj).to receive(:message)

* 6 conversions
    from: obj.should_not
      to: expect(obj).not_to

* 1 conversion
    from: -> { }.should
      to: expect { }.to

* 1 conversion
    from: =~ [1, 2]
      to: match_array([1, 2])