title: updating / maintaining bootstrap web design with LESS mixins
body: <p>Is it possible to maintain/update bootstrap with LESS like so: </p>
  
  <p>Imagine earlier version, for this example 2.3.2, it includes classes like span4, span12, etc. I would have custom-bootstrap.less like so:</p>
  
  <pre><code>.myown4columnclass {
      .span4;
  }
  </code></pre>
  
  <p>Then, the new version comes along, 3.0.0 I'd like to change custom-bootstrap.less to:</p>
  
  <pre><code>.myown4columnclass {
      .col-md-4;
  }
  </code></pre>