Leaflet 0.7.5 EPSG:3857 Spherical

<!DOCTYPE html>
<html>
  <head>
    <link rel="stylesheet" href="//cdn.leafletjs.com/leaflet-0.7.5/leaflet.css" />
    <link rel="stylesheet" href="style.css" />
  </head>
  <body>
    <div id="leaflet"></div>
    <script type="text/javascript" src="//cdn.leafletjs.com/leaflet-0.7.5/leaflet.js"></script>
    <script type="text/javascript" src="//rawgit.com/turban/Leaflet.Graticule/master/L.Graticule.js"></script>
    <script type="text/javascript" src="script.js"></script>
  </body>
</html>

var map = new L.Map('leaflet', {
  'center': [0, 0],
  'zoom': 0,
  'layers': [
    L.tileLayer('http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
      maxZoom: 19,
      attribution: '&copy; <a href="http://www.openstreetmap.org/copyright">OpenStreetMap</a>'
    })
  ]
});

L.graticule({ interval: 10 }).addTo(map);

body {
  margin: 0;
}

html, body, #leaflet {
  height: 100%;
}