title: jshint 'esversion: 6' issue
body: <p>I'm having an issue while running the jshint task.  It alerts me to add esversion: 6 to my .jshintrc file.  I entered it like so:  </p>
  
  <pre><code>{    
      "esversion": 6    
  }    
  </code></pre>
  
  <p>When that didn't work I tried adding it inline like so: </p>
  
  <pre><code>/*jshint esversion: 6 */    
  </code></pre>
  
  <p>However, it's still throwing the same error.  Has anyone else experienced this?</p>