title: How to run grunt-phantomas for multiple pages
body: <p>How to run grunt-phantomas for multiple pages?
  Presently I am able to pass a single URL in this grunt task grunt-phantomas, I tried googling but haven't found any support to pass multiple pages. </p>
  
  <p>Presently I am using </p>
  
  <p><code>phantomas: {
              prod: {
                  options: {
                      indexPath: './public/phantomas/',
                      options: {
                          'timeout': 30
                      },
                      url: 'http://www.homesofa.de/',
                      buildUi: true
                  }
              }
          }</code></p>
  
  <p>I am looking for something like:</p>
  
  <pre><code>phantomas: {
          prod: {
              options: {
                  indexPath: './public/phantomas/',
                  options: {
                      'timeout': 30
                  },
                  urls: [
                    'http://www.google.com',
                    'http://www.yahoo.com',
                    'http://www.github.com',
                    'http://www.facebook.com'
                    ],
                  buildUi: true
              }
          }
      }
  </code></pre>