title: How to form a multipart form data request using AFNetworking 1.3.3
body: <p>I am using <code>AFNetworking</code> 1.3.3.</p>
  
  <p>I need to make a <code>multipart/form-data</code> request to my server with image data and some other additional stuffs.</p>
  
  <p>I have no clue how to format this multipart request. How can I do it?</p>