title: How to configure grunt uncss on a php file?
body: <p>I'm new to grunt, and I'm trying to learn it. 
  It kind of simple if I have index.html file to deal with, but I don't have it, I have index.php instead - so I've tried : </p>
  
  <pre><code>uncss: {
  
      dist: {
  
          options: {
  
              ignore       : [/expanded/,/js/,/wp-/,/align/,/admin-bar/],
              stylesheets  : ['css/clean.min.css'],
              ignoreSheets : [/fonts.googleapis/],
              urls         : [],
          },
  
          files: {
              'css/clean.min.css': ['**/*.php']
          }
      }
  
  
  },
  </code></pre>
  
  <hr>
  
  <p>Result</p>
  
  <p>I keep getting </p>
  
  <pre><code>Running "uncss:dist" (uncss) task
  Fatal error: PhantomJS: Cannot open about:blank
  </code></pre>
  
  <hr>
  
  <p>Can someone please tell me what did I do wrong ? </p>
  
  <p>I would really any helps or concern on this.</p>