JS Bin // source http://jsbin.com/wuraha

<!DOCTYPE html>
<html>
<head>
<script src="https://d3js.org/d3.v3.min.js"></script>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>

var force = d3.layout.force()
    .charge(-100)
    .size([width, height]);

var svg = d3.select('body').append('svg')
    .attr('width', width)
    .attr('height', height);

d3.json('https://dl.dropboxusercontent.com/u/53166203/network.json', function(error, graph) {

force.nodes(graph.nodes)
      .links(graph.edges)
      .start();
    
  var link = svg.selectAll('line')
      .data(graph.edges)
      .enter().append('line')
      .style('stroke', '#bbb')
      .style('stroke-width', 1);
    
  var node = svg.selectAll('circle')
      .data(graph.nodes)
      .enter().append('circle')
      .attr('r', function(d) { return 8; })
      .style('fill', 'teal')
      .call(force.drag);
    
    
  force.on('tick', function() {
    link.attr('x1', function(d) { return d.source.x; })
        .attr('y1', function(d) { return d.source.y; })
        .attr('x2', function(d) { return d.target.x; })
        .attr('y2', function(d) { return d.target.y; });
    
    node.attr('cx', function(d) { return d.x; })
        .attr('cy', function(d) { return d.y; });
  });
});
</script>

var force = d3.layout.force()
    .charge(-100)
    .size([width, height]);

var svg = d3.select('body').append('svg')
    .attr('width', width)
    .attr('height', height);

d3.json('https://dl.dropboxusercontent.com/u/53166203/network.json', function(error, graph) {

Modified http://d3js.org/d3.v3.min.js to a secure url

https://d3js.org/d3.v3.min.js