title: What flash message types are available in Rails?
body: <p>So far I've got:</p>
  
  <ul>
  <li>:notice</li>
  <li>:alert</li>
  <li>:error</li>
  </ul>
  
  <p>but is there definitive list, that can be used in place, such as in <code>redirect_to path, :error =&gt; "Oh no!"</code>?</p>