title: Requirejs using shim
body: <p>Using shim by requirejs2, there is a way to tell to requires that a module is already loaded?</p>
  
  <p>Example:</p>
  
  <pre><code>&lt;script type="text/javascript" src="jquery.js"&gt;&lt;/script&gt;
  &lt;script type="text/javascript" src="undescrore.js"&gt;&lt;/script&gt;
  &lt;script type="text/javascript" src="require.js'"&gt;&lt;/script&gt;
  &lt;script type="text/javascript"&gt;
      require.config({
          paths: {
              "backbone": '/vendor/js/backbone-min.js'
          },
          shim: {
              'backbone': {
                  //These script dependencies should be loaded before loading
                  //backbone.js
                  deps: ['underscore', 'jquery'], // here I would like to load the already loaded library
              }
          }
      });
  &lt;/script&gt;
  </code></pre>