title: Backbone. Form with file upload, how to handle?
body: <p>I want to organize the workflow only through the REST API. I have a form that allows to upload image (enctype="multipart/form-data"). How do I handle this form via backbone? Help me please, how I can to serialize it into JSON with a file field. </p>
  
  <p>Thanks. 
  Vitaliy</p>