title: Include Underscore.js with jQuery no-conflict
body: <p>I need to include underscore.js in a platform that primarily  uses  Prototype.js and has jQuery in noconflict mode. </p>
  
  <p>How do we do it? Backbone for example shows that we can point to jQuery using Backbone.$ = $j.</p>
  
  <p>But underscorejs.org doesn't seem to have any information around it.</p>
  
  <p>Thanks,</p>