title: Force re-downloading image with Picasso
body: <p>I'm creating an application which is going to download image from specific url and display it on ImageView. Server changes this image over time, but url stays the same. So I want to implement such logic:</p>
  
  <ul>
  <li>When app is rotated or reopened, load image from apps cache</li>
  <li>When user clicks the download button, image should be re-downloaded from the network and replace the cache</li>
  </ul>
  
  <p>How do I implement such approach with Picasso? Or maybe some other library would fit it better?</p>