title: Intellij: add space after double slashes in line comment
body: <p>Is there a way in Intellij IDEA (I'm using version 13) to automatically add a space to line comments between the two slashes and the text:</p>
  
  <p>If I enter :</p>
  
  <blockquote>
    <p>//This is a comment</p>
  </blockquote>
  
  <p>I'd like to get the following when I run a code reformat (Ctrl-Alt-L on Windows)</p>
  
  <blockquote>
    <p>// This is a comment</p>
  </blockquote>
  
  <p>It's for Javascript files but should be working for other file types. </p>