title: Responsive full width carousel in Bootstrap 3 with min height and auto crop
body: <p>To create a full width carousel in Bootstrap 3, I placed it directly in a row, without wrapping container. The carousel stretches perfectly to full screen width and scales to phone format. But here is the problem: because the carousel has a 100% width, the carousel scales too much on phone (320 px width): it is technically correct, but it would be nice if the height was higher.</p>
  
  <p>Question: how to set a minimum height, maintain aspect ratio of the image and crop left and right on that minimum width?</p>