title: Line break in title of Rpres
body: <p>I am crafting my presentations as <code>.Rpres</code> as of lately. My title is a little long and breaks at an arbitrary location. Is there a way to influence this behavior? I tried HTML (<code>&lt;br&gt;</code>) and  <code>|</code> but no success... It sounds so elementary, but I did not find any info here or on Google.</p>
  <pre><code>Is there a way to display the heading in two lines?
  ========================================================
  </code></pre>
  <p>It should look kind of like this:</p>
  <pre><code>Is there a way to display 
  the heading in two lines?
  ========================================================
  </code></pre>
  <p>Thanks a lot</p>