title: Use Bing Maps tiles with Leaflet
body: <p>I'm trying to integrate Bing Maps tiles into Leaflet. All of the plugins I've found to do this have been no help though since they have no info on their usage. I could write a script in PHP to recieve the X, Y and Z coordinates from Leaflet (just set the script as the tile server URL), but I'd need a way to convert them to a Quadkey. An answer for either would be acceptable. I do have a Bing Maps API key if that helps.</p>