title: How to do file POST with CasperJS through plain Javascript, not through UI
body: <p>I can't figure out how to do the following:</p>
  
  <p>Before running my tests I would like to post (multipart) a file to the server. Our backend creates content profiles for these uploads which can then be accessed through the UI. It's this content profile I need to run tests on.</p>
  
  <p>I am aware of the .fill() functionality but this does not apply as I do not want to do file uploads through the UI. Is there any way this can be achieved via CasperJS or javascript or can anyone point me to documentation that might help me?</p>