fix some broken links

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

examples/rewrite/README.md

@@ -0,0 +1,66 @@
+Create an Ingress rule with a rewrite annotation:
+```
+$ echo "
+apiVersion: extensions/v1beta1
+kind: Ingress
+metadata:
+  annotations:
+    ingress.kubernetes.io/rewrite-target: /
+  name: rewrite
+  namespace: default
+spec:
+  rules:
+  - host: rewrite.bar.com
+    http:
+      paths:
+      - backend:
+          serviceName: echoheaders
+          servicePort: 80
+        path: /something
+" | kubectl create -f -
+```
+
+Check the rewrite is working
+
+```
+$ curl -v http://172.17.4.99/something -H 'Host: rewrite.bar.com'
+*   Trying 172.17.4.99...
+* Connected to 172.17.4.99 (172.17.4.99) port 80 (#0)
+> GET /something HTTP/1.1
+> Host: rewrite.bar.com
+> User-Agent: curl/7.43.0
+> Accept: */*
+>
+< HTTP/1.1 200 OK
+< Server: nginx/1.11.0
+< Date: Tue, 31 May 2016 16:07:31 GMT
+< Content-Type: text/plain
+< Transfer-Encoding: chunked
+< Connection: keep-alive
+<
+CLIENT VALUES:
+client_address=10.2.56.9
+command=GET
+real path=/
+query=nil
+request_version=1.1
+request_uri=http://rewrite.bar.com:8080/
+
+SERVER VALUES:
+server_version=nginx: 1.9.11 - lua: 10001
+
+HEADERS RECEIVED:
+accept=*/*
+connection=close
+host=rewrite.bar.com
+user-agent=curl/7.43.0
+x-forwarded-for=10.2.56.1
+x-forwarded-host=rewrite.bar.com
+x-forwarded-port=80
+x-forwarded-proto=http
+x-real-ip=10.2.56.1
+BODY:
+* Connection #0 to host 172.17.4.99 left intact
+-no body in request-
+```
+