title: Convert text file data into table in R
body: <p>I have data that has the form</p>
  
  <pre><code>sr:user1
  target:user2
  vt:4
  time:12
  sr:user3
  target:user4
  vt:42
  time:120
  </code></pre>
  
  <p>Is there a simple way to make the data looks like the following by using R:</p>
  
  <pre><code>sr        target  vt  time
  user1     user2    4   12
  user3     user4    42  120
  </code></pre>