fix some broken links

upgrade all nginx examples to latest version
moved some examples from contrib to this repo

examples/customization/custom-upstream-check/README.md

@@ -0,0 +1,45 @@
+This example shows how is possible to create a custom configuration for a particular upstream associated with an Ingress rule.
+
+```
+echo "
+apiVersion: extensions/v1beta1
+kind: Ingress
+metadata:
+  name: echoheaders
+  annotations:
+    ingress.kubernetes.io/upstream-fail-timeout: "30"
+spec:
+  rules:
+  - host: foo.bar.com
+    http:
+      paths:
+      - path: /
+        backend:
+          serviceName: echoheaders
+          servicePort: 80
+" | kubectl create -f -
+```
+
+Check the annotation is present in the Ingress rule:
+```
+kubectl get ingress echoheaders -o yaml
+```
+
+Check the NGINX configuration is updated using kubectl or the status page:
+
+```
+$ kubectl exec nginx-ingress-controller-v1ppm cat /etc/nginx/nginx.conf
+```
+
+```
+....
+    upstream default-echoheaders-x-80 {
+        least_conn;
+        server 10.2.92.2:8080 max_fails=5 fail_timeout=30;
+
+    }
+....
+```
+
+
+![nginx-module-vts](custom-upstream.png "screenshot with custom configuration")