title: SDWebImage UIButton setImageWithURL return small image on iOS6
body: <p>I use SDWebImage in my app for setting image for button. But when I try to do it</p>
  
  <pre><code>[self.buttonPhoto setImageWithURL:self.user.avatarURL forState:UIControlStateNormal];
  </code></pre>
  
  <p>I see that image twice smaller, than it should be.</p>
  
  <p><img src="https://i.stack.imgur.com/GC5PR.png" alt="enter image description here"></p>
  
  <p>To compare I write setting local image for button</p>
  
  <pre><code>[self.buttonPhoto setImage:[UIImage imageNamed:@"sara"] forState:UIControlStateNormal];
  </code></pre>
  
  <p>In this case I see normal picture.</p>
  
  <p><img src="https://i.stack.imgur.com/WrwIz.png" alt="enter image description here"></p>
  
  <p>May be you know about this problem and know solution? Thnx.</p>