remove gem dev dependency on rspec
consistently use class def
use guard-compat
update to RSpec 3
Convert specs to RSpec 3.1.7 syntax with Transpec

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

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

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

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

* 3 conversions
    from: be_true
      to: be_truthy

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

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

* 1 conversion
    from: be_false
      to: be_falsey

* 1 conversion
    from: obj.should_not
      to: expect(obj).not_to

For more details: https://github.com/yujinakayama/transpec#supported-conversions
stub out Guard::UI.info
allow rbx to fail (segv)
Merge pull request #26 from guard/use_guard_compat

Use guard compat