title: Capybara matcher for presence of button or link
body: <p>Users on web page don't distinguish between "button" and "link styled as button".
  Is there a way to add check whether a "button or link" is present on page?</p>
  
  <p>For example Capybara has step:</p>
  
  <pre><code>page.should have_button('Click me')
  </code></pre>
  
  <p>which does not find links styled as buttons.</p>