title: zoomstart, but no zoomend event fired on pinch zoom
body: <p>I need to detect the zoomend on a pinch zoom with <code>leaflet v1.0.0.rc3</code>. In rear cases the <code>zoomend</code> event ist not fired.</p>
  
  <p>Anybody else got those problems? How to solve this?</p>
  
  <p>Currently testing an old android with a chromium web view, 3D enabled. </p>
  
  <pre><code>...
  
  map.on('zoomstart', function(e){
      console.log("zoomstart");
      //hide some layers...
  });
  
  map.on('zoomend', function(e){
      console.log("zoomend: " + map.getZoom());
      //show some layers again...
  });
  
  ...
  </code></pre>