title: Openlayers3 with custom tile server
body: <p>I've got a problem with the latest openlayers3 beta. I'm trying to use custom tile server using xyz layer. The thing is the tiles are re not rendered for some reason. Using firebug I can see that the tile requests are send and the images are fetched succesfuly, though they do not show up...
  Everything works in chrome however.</p>
  
  <pre><code>var baseLayer = new ol.layer.Tile({
      source: new ol.source.XYZ({
          url: 'http://xx.xx.xx.xx:33333/osm/{z}/{x}/{y}.png'
      })
  });
  
  var map = new ol.Map({
  controls: ol.control.defaults().extend([
  ]),
      target: 'map',
      layers: [baseLayer],
      view: new ol.View2D({
      center: ol.proj.transform([21.999529, 50.041682], 'EPSG:4326', 'EPSG:3857'),
              zoom: 13
      })
  });
  </code></pre>