title: Unable to log error with postcss reporter and postcss bem linter in Gruntfile
body: <p>I am using grunt-postcss in my gruntfile.js and everything works fine except the postcss-bem-linter which should log warning in the console if the BEM rules are not followed. Here a snippet of configuration in gruntfile.js:</p>
  
  <pre><code>var preprocessorsAfterSprites = [
      require('postcss-bem-linter')(function (a) {
          console.log(a);
      }), // this just doesn't want to work right now
      require('postcss-reporter')
  ];
  
  function getPostCssPreprocessors(name) {
      return preprocessorsAfterSprites;
  }
  
  grunt.initConfig({
      postcss: {
          options: {
              map: { inline: false }
          },
          golden: {
              src: '&lt;%= dirs.pcss %&gt;/golden/main.scss',
              dest: '&lt;%= dirs.css %&gt;/golden.css',
              options: {
                  processors: getPostCssPreprocessors('golden')
              }
          }
      }
  });
  </code></pre>
  
  <p>When I try to type grunt postcss:golden I dont have any output from the console log. Any ideas why?</p>