title: Less mixin issue for multiple box-shadow arguments
body: <p>I'm working in a project were i have to use less, personally I always use stylus, but I can't with this project, so I have the next question. how can i do this, that i'm doing with stylus, with less ?  The problem is the number of arguments.</p>
  
  <p>in stylus :</p>
  
  <pre><code>box-shadow()
      -webkit-box-shadow arguments
      -moz-box-shadow arguments
      box-shadow arguments
  
  .div {
      box-shadow 0 2px 8px rgba(0, 0, 0, 0.3), inset 0 1px rgba(255, 255, 255, 0.2), inset 0 10px rgba(255, 255, 255, 0.2), inset 0 10px 20px rgba(255, 255, 255, 0.2), inset 0 -15px 30px rgba(0, 0, 0, 0.2)
  }
  
  .div2 {
      box-shadow 0 2px 8px rgba(0, 0, 0, 0.3)
  }
  </code></pre>
  
  <p>output : </p>
  
  <pre><code>.div {
    -webkit-box-shadow: 0 2px 8px rgba(0,0,0,0.3), inset 0 1px rgba(255,255,255,0.2), inset 0 10px rgba(255,255,255,0.2), inset 0 10px 20px rgba(255,255,255,0.2), inset 0 -15px 30px rgba(0,0,0,0.2);
    -moz-box-shadow: 0 2px 8px rgba(0,0,0,0.3), inset 0 1px rgba(255,255,255,0.2), inset 0 10px rgba(255,255,255,0.2), inset 0 10px 20px rgba(255,255,255,0.2), inset 0 -15px 30px rgba(0,0,0,0.2);
    box-shadow: 0 2px 8px rgba(0,0,0,0.3), inset 0 1px rgba(255,255,255,0.2), inset 0 10px rgba(255,255,255,0.2), inset 0 10px 20px rgba(255,255,255,0.2), inset 0 -15px 30px rgba(0,0,0,0.2);
  }
  .div2 {
    -webkit-box-shadow: 0 2px 8px rgba(0,0,0,0.3);
    -moz-box-shadow: 0 2px 8px rgba(0,0,0,0.3);
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
  }
  </code></pre>