title: Symfony2 Assetic get asset urls from inside controller, not template
body: <p>I want to include the url to one of the assets in my bundle in the controller, not in the template. </p>
  
  <p>More specifically, but not very important: I make a HighChart chart using obHighChartsBundle, and I have to plot some special icons in some points of the graph I am producing. Therefore I need the url to the icon, which is in my bundle's asset folder.</p>
  
  <p>Is it possible to call some kind of asset manager from the controller and get the correct url to this asset?</p>