title: Grunt sass multiple dest files
body: <p>Let's see this part of configuration of grunt sass module : </p>
  
  <pre><code>dev: {
      src: 'dev/sass/style.scss',
      dest: '../site/web/assets/css/style.css',
      options: {
          style: 'expand',
          compass: true
      }
  }
  </code></pre>
  
  <p>This works as expected. Now I want Grunt to compile my scss file to 2 destinations, so I tried :</p>
  
  <pre><code>dev: {
      src: 'dev/sass/style.scss',
      dest: ['../site/web/assets/css/style.css','another/path/style.css']
      options: {
          style: 'expand',
          compass: true
      }
  }
  </code></pre>
  
  <p>But it returns an error :</p>
  
  <pre><code>Warning: Unable to write "../site/web/assets/css/style.css,another/path/style.css" file (Error code: undefined). Use --force to continue.
  </code></pre>
  
  <p>Is it possible ? What am I doing wrong ?</p>