Modified http://cdnjs.cloudflare.com/ajax/libs/leaflet/0.7.3/leaflet.js to a secure url
Updated missing url https://rawgit.com/Asymmetrik/leaflet-d3/master/dist/leaflet-d3.js to https://cdn.jsdelivr.net/gh/asymmetrik/leaflet-d3/dist/leaflet-d3.js
Modified http://d3js.org/d3.v3.min.js to a secure url
Updated missing url https://rawgit.com/d3/d3-plugins/master/hexbin/hexbin.js to https://cdn.jsdelivr.net/gh/d3/d3-plugins/hexbin/hexbin.js
https://cdnjs.cloudflare.com/ajax/libs/leaflet/0.7.3/leaflet.js
https://rawgit.com/Asymmetrik/leaflet-d3/master/dist/leaflet-d3.js
https://d3js.org/d3.v3.min.js
https://rawgit.com/d3/d3-plugins/master/hexbin/hexbin.js