title: Android Retrofit - onProgressUpdate for showing Progress Notification
body: <p>I'm currently using Retrofit by Square for Android network communications. Is there a way to get its progress during a task to create a progress notification, something similar to that which Facebook uses when uploading an image?</p>
  
  <p>Use Case would be to load an image hopefully of full image quality without compression or scaling.</p>
  
  <p>I see how it is possible with an asynctask but that would defeat the purpose of using Retrofit. However that might be the route I would have to take.</p>