Leaflet Map with GeoJSON popups

<!doctype html>
<html>
<head>
  <style type="text/css">
    body {
      padding: 0;
      margin: 0;
    }

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

  </style>
  <!--<script src="http://cdn.leafletjs.com/leaflet-0.7.2/leaflet.js"></script>-->
  <script src='https://api.tiles.mapbox.com/mapbox.js/v2.1.4/mapbox.js'></script>
	<link href='https://api.tiles.mapbox.com/mapbox.js/v2.1.4/mapbox.css' rel='stylesheet' />
  <script src="http://code.jquery.com/jquery-2.1.0.min.js"></script>
</head>
<body>
  <div id="map"></div>
  <script>

  L.mapbox.accessToken = 'ENTER API TOKEN HERE';
  
  var mapTiles = L.tileLayer('http://a.tiles.mapbox.com/v3/ENTER MAP ID HERE/{z}/{x}/{y}.png', {
    maxZoom: 18
  });  

  $.getJSON("map.geojson", function(data) {

  	function onEachFeature(feature, layer) {
  
        layer.bindPopup("Name: " + feature.properties.name + "<br>" + "Population: " + feature.properties.population);
   	}  	

    var geojson = L.geoJson(data, {
      onEachFeature: onEachFeature
    });


    var map = L.map('map').fitBounds(geojson.getBounds());
    mapTiles.addTo(map);
    geojson.addTo(map);
  });

  </script>
</body>
</html>
{"type":"FeatureCollection","features":[{"type":"Feature","properties":{"name":"london","population":123456789},"geometry":{"type":"Polygon","coordinates":[[[-0.41473388671875,51.355488840149505],[-0.41473388671875,51.61290019118336],[0.21697998046874997,51.61290019118336],[0.21697998046874997,51.355488840149505],[-0.41473388671875,51.355488840149505]]]}},{"type":"Feature","properties":{"name":"southampton","population":5},"geometry":{"type":"Polygon","coordinates":[[[-1.57928466796875,50.816347765191075],[-1.57928466796875,50.978317790801],[-1.21673583984375,50.978317790801],[-1.21673583984375,50.816347765191075],[-1.57928466796875,50.816347765191075]]]}},{"type":"Feature","properties":{"name":"isle of white","population 10":""},"geometry":{"type":"Polygon","coordinates":[[[-1.6094970703125,50.69123805220047],[-1.461181640625,50.73993156768006],[-1.295013427734375,50.7903108164132],[-1.1631774902343748,50.76339072520501],[-1.0052490234375,50.6903680653673],[-1.031341552734375,50.61723156247397],[-1.242828369140625,50.567538356277055],[-1.418609619140625,50.56404914388948],[-1.701507568359375,50.63901028125873],[-1.6094970703125,50.69123805220047]]]}}]}