title: Grunt-eslint & enabling `--fix` flag to auto fix violations
body: <p>I know <code>eslint</code> CLI itself has a <code>--fix</code> flag, but I can't tell from the documentation how to use this via <code>eslintConfig</code> (in <code>package.json</code>) or in the grunt-eslint configuration in my Gruntfile.</p>
  
  <p>I have the following config in <code>package.json</code>:</p>
  
  <pre><code>"env": {
    "browser": true,
    "amd": true
  },
  "extends": "eslint:recommended",
  </code></pre>
  
  <p>and invoke it via a <code>lint</code> task using this Grunt config:</p>
  
  <pre><code>    eslint: {
          target: [
              'src/app/**/*.js'
          ],
          format: 'checkstyle'
      },
  </code></pre>
  
  <p>How can I enable the <code>--fix</code> flag in this scenario?</p>