title: File upload with Backbone
body: <p>I'm using Backbone.js in a Rails app and I need to do file uploads as part of one of the Backbone models.</p>
  
  <p>I don't believe Backbone allows for multi-part file upload out of the box. Has anyone managed to get it working via some plugin or with another external lib? How can I extend Backbone.js to support this?</p>