title: Convert list into data.frame
body: <p>I have read a html table with </p>
  
  <pre><code>tables &lt;- readHTMLTable(path, which=1)
  </code></pre>
  
  <p>and would like to process the information further. Currently my data looks like this.</p>
  
  <pre><code>Category Entry
  A 1
  B 2
  C 3
  A 4
  B 5
  C 6
  A 7
  B 8
  C 9
  </code></pre>
  
  <p>I would like to have a data frame that looks like this.</p>
  
  <pre><code>A B C
  1 2 3 
  4 5 6
  7 8 9
  </code></pre>
  
  <p>Is there a simple way to do this?</p>