title: How to specify Middleman's partials directory globally?
body: <p>In Middleman, I can specify that I want to yield a partial located in a specific directory by using</p>
  
  <pre><code>= partial "partials/imports/js"
  </code></pre>
  
  <p>I'd like Middleman to know in which directory my partials reside.  How do I modify config.rb so that I can just use <code>= partial "js"</code>?</p>