title: Add author affiliation in R markdown beamer presentation
body: <p>How to add author affiliation in a new line in an rmarkdown beamer presentation?</p>
  
  <pre><code>---
  title: "This is the title"
  author: "Author"
  date: "Thursday, April 09, 2015"
  output: beamer_presentation
  ---
  ## Slide with Bullets
  
  - Bullet 1
  - Bullet 2
  - Bullet 3
  </code></pre>
  
  <p>The desire title slide should be </p>
  
  <p><strong>This is the title</strong></p>
  
  <p>Author</p>
  
  <p>Affiliation</p>
  
  <p><em>Thursday, April 09, 2015</em></p>