title: Unable to extract DIC
body: <p>I am using runjags and am trying to get the DIC for my model.  </p>
  
  <p>I know that if I print the runjags object it will return the model summary which would include the DIC, but my model a lot of variables, so calculating the summary statistics is taking a long time.  When I use <code>summarise=FALSE</code> the DIC is not returned.</p>
  
  <p>I have tried using: <code>extract(runJagsObj, what='dic')</code></p>
  
  <p>But it returns this error message:
  <code>"Error: Please supply column name"</code></p>
  
  <p>Is there a way to either see the DIC in the summary information without having to calculate the summary statistics for every variable?  Or why is extract not working? </p>
  
  <p>I'm using <code>method=parallel</code> if that is helpful information.</p>