title: Make specs pending conditionally
body: <p>In my app, I sometimes write tests using iterations like this:</p>
  <pre><code>%w[one two three].each do |number|
    it 'is going to fail under several circumstances' do
      expect(someting_from(number))
    end
  end
  </code></pre>
  <p>And I know that sometimes for several instances in the array I iterate over this spec can temporarily fail but it's going to be fine some days after, so I want to conditionally skip them, using internal RSpec pending mechanics, so I get notified when this spec stops failing. Is there a way to do this?</p>