title: How can I include the original filename when Sprockets combines javascript files?
body: <p>We are using the latest version of Sprockets on Rails 3.0.10. Everything is working great, and overall it's been a smooth and problem free deployment, but we do have one minor annoyance that I hope there is a simple solution for.</p>
  
  <p>When javascript files are combined together, there's no simple, straightforward way to determine what file a particular bit of javascript came from when I'm debugging in a browser.</p>
  
  <p>We use SASS as well and I love the way that it includes comments indicating where the rule can be found in my original CSS file.</p>
  
  <p>Are there options or flags I can set on Sprockets to allow similar behaviour? (say, an auto-generate comment at the beginning of each included file indicating it's original path)</p>