update to RSpec 2.99
add transpec
Convert specs to RSpec 2.99.2 syntax with Transpec

This conversion is done by Transpec 2.3.8 with the following command:
    transpec

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

* 49 conversions
    from: obj.should_receive(:message)
      to: expect(obj).to receive(:message)

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

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

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

* 9 conversions
    from: obj.should_not_receive(:message)
      to: expect(obj).not_to receive(:message)

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

* 6 conversions
    from: it { should_not ... }
      to: it { is_expected.not_to ... }

* 3 conversions
    from: be_false
      to: be_falsey

* 3 conversions
    from: be_true
      to: be_truthy

* 1 conversion
    from: Klass.any_instance.stub(:message)
      to: allow_any_instance_of(Klass).to receive(:message)

* 1 conversion
    from: RSpec.configure { |c| c.color_enabled = something }
      to: RSpec.configure { |c| c.color = something }

* 1 conversion
    from: obj.stub(:message).and_return { value }
      to: obj.stub(:message) { value }

For more details: https://github.com/yujinakayama/transpec#supported-conversions
update to RSpec 3.1
Convert specs to RSpec 3.1.7 syntax with Transpec

This conversion is done by Transpec 2.3.8 with the following command:
    transpec

* 43 conversions
    from: obj.stub(:message => value)
      to: allow(obj).to receive_messages(:message => value)

For more details: https://github.com/yujinakayama/transpec#supported-conversions
remove RSpec 3.1 deprecation
update specs and config for RSpec 3.1
reduce RSpec verbosity outside CI (Rakefile)
use Guard::Compat
use guard-rspec 4.4.2
Merge pull request #131 from guard/use_guard_compat

use Guard::Compat + project updates