Add AWS ELB detection (#2498)

* Add AWS ELB detection

This can be tested [here](https://aphextwin.warp.net/)

* oups

src/apps.json

@@ -527,6 +527,16 @@
       "icon": "aws-ec2.svg",
       "website": "http://aws.amazon.com/ec2/"
     },
+    "Amazon ELB": {
+      "cats": [
+        31
+      ],
+      "cookies": {
+        "AWSELB": ""
+      },
+      "icon": "aws-elb.png",
+      "website": "https://aws.amazon.com/elasticloadbalancing/"
+    },
     "Amazon S3": {
       "cats": [
         19