Convert specs to RSpec 2.99.2 syntax with Transpec

This conversion is done by Transpec 2.3.6 with the following command:
    transpec

* 10 conversions
    from: obj.stub(:message)
      to: allow(obj).to receive(:message)

* 4 conversions
    from: be_false
      to: be_falsey

* 4 conversions
    from: be_true
      to: be_truthy

* 2 conversions
    from: Klass.any_instance.stub(:message)
      to: allow_any_instance_of(Klass).to receive(:message)

* 2 conversions
    from: expect(collection).to have(n).items
      to: expect(collection.size).to eq(n)

For more details: https://github.com/yujinakayama/transpec#supported-conversions
Merge pull request #2 from testerab/use_rspec_3.0.0

Convert specs to RSpec 2.99.2 syntax with Transpec