Add sample for load json from url - #379

htdocs/data/c3_test_3.json

+[
+  { "id": 1, "name": "abc", "data1": 1200, "data2": 500 },
+  { "id": 2, "name": "efg", "data1": 900,  "data2": 600 },
+  { "id": 3, "name": "pqr", "data1": 1150, "data2": 300 },
+  { "id": 4, "name": "xyz", "data1": 1020, "data2": 900 }
+]

htdocs/samples/data_url.html

@@ -37,6 +37,16 @@
         });
       }, 3000);
 
+      setTimeout(function () {
+        chart.load({
+          url: '/data/c3_test_3.json',
+          mimeType: 'json',
+          keys: {
+            value: ['data1', 'data2']
+          }
+        });
+      }, 4000);
+
     </script>
   </body>
 </html>