title: DataTables sorting icons don't show up without minified CSS
body: <p>I came across something that I thought was very strange while installing the dataTables plugin in my app.  I am using ruby on rails 4.2.</p>
  
  <p>If i have only the minified or only the non-minified js and css <code>jquery.dataTables</code> files in my assets, the sorting icons do not load properly.<br>
  I get a <code>RoutingError (No route matches [GET] "/images/sort_desc.png")</code>.  I've seen other people discuss this error, but have not actually seen a good solution for it. 
  If I change the path to retrieve the images inside <code>jquery.dataTables.css</code> or the min version of the file, I still get the same error.  The path in the error message does not change!</p>
  
  <p>The strange thing, is if I use the min.css and regular js files, the sorting icons load properly!
  Recap:
  <code>jquery.dataTables.min.css</code> &amp; <code>jquery.dataTables.js</code>  : WORKS</p>
  
  <p><code>jquery.dataTables.css</code> &amp; <code>jquery.dataTables.js</code>  : DOES NOT WORK</p>
  
  <p><code>jquery.dataTables.min.css</code> &amp; <code>jquery.dataTables.min.js</code>  : DOES NOT WORK</p>
  
  <p><code>jquery.dataTables.css</code> &amp; <code>jquery.dataTables.min.js</code>  : DOES NOT WORK</p>
  
  <p>I am putting these files inside <code>vendor/assets/stylesheets</code>, <code>../javascripts</code>, <code>../images</code>.
  What is going on here?</p>